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VT-VRPA2-537-10/V0/RTS力士乐电气放大器

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品牌: Rexroth力士乐
型号: VT-VRPA2-537-10/V0/RTS
类型: 电气放大器
产地: 德国
单价: 4000.00元/个
所在地: 上海
有效期至: 长期有效
最后更新: 2019-01-16 17:17
浏览次数: 293
询价
店铺基本资料信息
 
产品详细说明
 诸药为各病之药,茶为万病之药。—— 唐·陈藏器《本草拾遗》
0811405138 VT-VRPA2-537-10/V0/RTS力士乐电气放大器
博世力士乐 电子元件 阀放大器 Bosch Rexroth 模拟放大器 电子放大器
0811405138 VT-VRPA2-537-10/V0/RTS VT-VRPA2-537-10/V0/RTS阀放大器
0811405138 VT-VRPA2-537-10/V0/RTS VT-VRPA2-537-10/V0/RTS阀放大器
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
Electronics
电子元件
Valve Amplifiers
阀放大器
for high-response valves
用于高频响阀
Analog, Euro-card format
模拟,欧洲板卡格式
电气放大器
类型 VT-VRPA2-5...-1X/V0/RTS
组件系列 1X
特点
- 适用于控制带有正遮盖的直动式高频响阀
- 带有附加电子板卡(子卡)的放大器
- 用于安装在 19" 英寸机架上的欧洲制式的模拟放大器
- 调节可能性
  ·阀零位
  ·灵敏度
  ·斜坡时间
- 可控输出级
- 选通输入
- 可以关闭的斜坡发生器
- 补偿阶跃
- 防短路输入和输出
- 外部斜坡时间关闭
- 通过差动输入进行外部电压控制的斜坡时间设置
- 实际值电缆的电缆断连检测
- 带有 PID 调节的位置控制
力士乐放大器
用于对直接控制式调节阀(型号 4WRP,系列 1X)进行控制的电子放大器
型号 VT-VRPA2-5...
VT-VRPA2-537-1X/V0/RTS
- 材料号:0811405138
- 型号:VT-VRPA2 = 电子放大器
- 型号代码:537 = 3.7A 电磁铁
- 设备系列:1X = 系列 1X
- 版本:V0 = 基本版本
- 选项:RTS = 电压控制斜坡
技术数据
- 结构型式:控制卡
- 类型:模拟式
- 电源电压:24 V DC
- 阀电流:3,7/50
- 输入端 1:0...+-10 V
- 输入端 2:0...+-10 V
- 重量:420
适用于阀
4WRP 10 E...1X
4WRP 10 W...1X
博世力士乐 电子元件 阀放大器 Bosch Rexroth 模拟放大器 电子放大器
0811405138 VT-VRPA2-537-10/V0/RTS VT-VRPA2-537-10/V0/RTS阀放大器
0811405138 VT-VRPA2-537-10/V0/RTS VT-VRPA2-537-10/V0/RTS阀放大器
供应商信息:上海心雨机电设备有限公司
Attn:闫菲18717727482
Email:395717253@qq.com
Tel:021-60510250
Fax:021-55032832
Q扣扣Q:395717253
吞药养性能令人无病,不能寿之为仙。—— 汉·王充《养性书》
0811405138 VT-VRPA2-537-10/V0/RTS力士乐电气放大器
博世力士乐 电子元件 阀放大器 Bosch Rexroth 模拟放大器 电子放大器 控制卡 电子板卡
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
Electronics
电子元件
Valve Amplifiers
阀放大器
for high-response valves
用于高频响阀
Analog, Euro-card format
模拟,欧洲板卡格式
用于高频响阀的阀放大器
VT-VRPA2-537-1X/V0/RTS
- 组件系列 1X
- 模拟,欧洲板卡格式
- 适用于以下类型的阀:4WRP 10
特征
- 闭环控制的末级
- 位置闭环控制带 PID 特性
- 具有较短驱动时间的快速激励和快速断电
- 选通输入
- 防短路输出
- 可调节斜坡时间、灵敏度和零电位
- 实际值电缆的电缆断裂识别
 
电气放大器
类型 VT-VRPA2-5...-1X/V0/RTS
组件系列 1X
订货代码,附件
"VT-VRPA2-*-1X/V0/RTS"
"R"--液压组件:
  R = 对于具有电气反馈的阀
"P"--阀类型:
  P = 高频响阀
"A"--控制:
  A = 模拟
"2"--输出级:
  2 = 每个高频响阀 2 个输出级
"*"--以下类型的序列号:
  527 = 规格 6
  537 = 规格 10
"1X"--组件系列 10 至 19(10 至 19:技术数据和插脚分配不变)
"V0"--客户定制型号:
  V0 = 标准样本型号
"RTS"--选件:
  RTS = 通过信号实现的斜坡功能设置
 
首选类型
0811405137 VT-VRPA2-527-10/V0/RTS
用于带电气位置反馈和弯折的特性曲线的高频响阀4WRP 6...S-1X...
0811405138 VT-VRPA2-537-10/V0/RTS
用于带电气位置反馈和弯折的特性曲线的高频响阀4WRP 10...S-1X...
 
配套的板卡插槽
- 开放式板卡插槽 VT 3002-1-2X/32F(请参阅样本 29928)。
  仅用于安装控制柜!
 
Bosch Rexroth Electronics
博世力士乐电子元件
Valve amplifiers for high-response valves
用于高频响阀的阀放大器
Analog, Euro-card format
模拟,欧洲板卡格式
VT-VRPA2-5...-1X/RTS
VT-VRPA2-537-1X/RTS
VT-VRPA2-5...-1X/RTP
VT-VRPA2-537-1X/RTP
VT-VRRA1-527-1X
VT-VRRA1-5...-2X/V0
VT-VRRA1-537-2X/V0
VTVRRA15...2X/...K40-AGC, VTVRRA15...2X/...K60AGC
VTVRRA15372X/...K40-AGC
VT-VRRA1-5...-2X/V0/KV-AGC
VT-VRRA1-537-2X/V0/KV-AGC
VT-VRRA1-527-2X/V0/2STV
VT-VRRA1-527-2X/V0/PO-IS
VT-VRRA1-527-2X/V0/K40-AGC-2STV
VT-KRRA2-5...-2X
VT-KRRA2-537-2X
VT-VRPA1-527-2X/V0/RTS-2STV
VT-VRPA1-537-1X
VT-SR31-1X to VT-SR38-1X
VT-SR41-1X, VT-SR42-1X, VT-SR43-1X
……
以药物养身,以术数延命。—— 晋·葛洪《抱朴子·论仙》
0811405138 VT-VRPA2-537-10/V0/RTS力士乐电气放大器
博世力士乐 电子元件 阀放大器 Bosch Rexroth 模拟放大器 电子放大器 控制卡 电子板卡
Bosch Rexroth Industrial Hydraulics
博世力士乐工业液压
Electronics
电子元件
Valve Amplifiers
阀放大器
用于不带电气位置反馈的比例阀的阀放大器
模拟,模块化设计
VT-MSPA.-2X
VT-MSPA1-5...-1X
VT-MSPA1-525-1X
VT-MSPA2-5...-1X
VT-MSPA1-1-1X
VT-MSPA1-10-1X
VT-MSPA1-11-1X
VT-MSPA1-30-1X
VT-MSPA1-150-1X
VT-MSPA1-200-1X
VT-MSPA1-50-1X
VT-MSPA2-1-1X
VT-MSPA2-200-1X
VT 11131-1X, VT 11132-1X
VT 11132-1X
VT 11118-1X
VT-MSRA1-1-1X
模拟,连接器设计
VT-SSPA1-5...-2X
VT-SSPA1-525-2X
VT-SSPA1-1-1X, VT-SSPA1-50-1X
VT-SSPA1-5-1X, VT-SSPA1-100-1X
VT-SSPA1-50-1X
VT-SSPA1-100-1X
VT-SSPA1-150-1X
VT-SSPA1-525-1X/V0
模拟,欧洲板卡格式
VT-VSPA1-5...-1X/RTP
VT-VSPA1-525-1X/V0/RTP
VT-VSPA1-10-1X
VT-VSPA1-11-1X
VT-VSPA1(K)-1-1X
VT-VSPA1-2-1X
VT-VSPA2-1-2X
VT 2000-5X
数字,欧洲板卡格式
VT-VSPD-1-2X
 
用于带电气位置反馈的比例阀的阀放大器
模拟,模块化设计
VT-MRMA1-1-1X
VT-MRPA1-1...-1X
VT-MRPA1-150-1X
VT-MRPA1-151-1X
VT-MRPA1-1-1X, VT-MRPA1-2-1X, VT-MRPA2-1-1X, VT-MRPA2-2-1X
VT-MRPA2-1-1X, VT-MRPA2-2-1X
模拟,欧洲板卡格式
VT-VRPA1-5...-1X
VT-VRPA1-537-1X
VT-VRPA1-5...-1X/RTP
VT-VRPA1-537-1X/RTP
VT-VRPA1-1...-1X
VT-VRPA1-150-1X
VT-VRPA1-151-1X
VT-VRPA1-50-1X, VT-VRPA1-51-1X, VT-VRPA1-52-1X
VT-VRPA1-51-1X
VT-VRPA1-52-1X
VT-VRPA2-1-1X, VT-VRPA2-2-1X
VT-VRM1-1-1X
数字,欧洲板卡格式
VT-VRPD-2-2X
 
用于调节轴向柱塞泵体积流量的比例阀的阀放大器
模拟,欧洲板卡格式
VT 5035-1X
VT-SR7-1X
数字,欧洲板卡格式
VT-VPCD-1X (A4VS)
 
用于高频响阀的阀放大器
模拟,欧洲板卡格式
VT-VRPA2-5...-1X/RTS
VT-VRPA2-537-1X/RTS
VT-VRPA2-5...-1X/RTP
VT-VRPA2-537-1X/RTP
VT-VRRA1-527-1X
VT-VRRA1-5...-2X/V0
VT-VRRA1-537-2X/V0
VTVRRA15...2X/...K40-AGC, VTVRRA15...2X/...K60AGC
VTVRRA15372X/...K40-AGC
VT-VRRA1-5...-2X/V0/KV-AGC
VT-VRRA1-537-2X/V0/KV-AGC
VT-VRRA1-527-2X/V0/2STV
VT-VRRA1-527-2X/V0/PO-IS
VT-VRRA1-527-2X/V0/K40-AGC-2STV
VT-KRRA2-5...-2X
VT-KRRA2-537-2X
VT-VRPA1-527-2X/V0/RTS-2STV
VT-VRPA1-537-1X
VT-SR31-1X to VT-SR38-1X
VT-SR41-1X, VT-SR42-1X, VT-SR43-1X
 
用于伺服阀的阀放大器
模拟,模块化设计
VT 11021-1X
模拟,欧洲板卡格式
VT-SR1-1X
VT-SR2-1X
VT-SR11-1X
 
用于开/关阀的阀放大器
模拟,连接器设计
VT-SSV-1-2X
VT-SSBA1-PWM-1X
模拟,模块化设计
VT-MSFA1-50-1X
VT-MSFA1-100-1X
VT-MSFA1-150-1X
 
控制值准备
模拟,模块化设计
VT-SWMA-1-1X
VT-SWMAK-1-1X
VT-SWMA3-5-1X
模拟,欧洲板卡格式
VT-SWKA1-1X
VT-SWKA2-5-1X
 
轴调节
集成阀
总线阀4WREF
p/Q 阀
STW 0195, STW 0196
4WREQ
轴控制器
4WRPNH../24C/P
4WRPNH../24F..
4WRPDH
4WRLD -4X
标准
VT-HACD-DPQ-2X
VT-HACD-1-1X
VT-HACD-3-2X
可编程
VT-HMC
VT-HNC100...3X
VT-HNC100.../S-3X
SYHNC100-SEK-3X
VT-HNC100...2X
高级
VT-MAC8
MLC - CML
MLC - XM
模拟
VT-MACAS-1X
VT-VACAF-1X
VT-VACAP-500-20/V0...
VT-VARAP1-2X
泵控制
VT-HPC-1-1X
VT-VPCD-1X (A4VS)
 
电子元件附件
机架和板卡插槽
VT 10812-2X
VT 12302-3X
VT 19101、VT 19102、VT 19103
VT 3002-2X
电源和稳压设备
VT 11006-1X
VT 11110-1X
VT 11116-1X
VTNE302X, VTNE311X
测试和维修设备
VT-SVTSY-1-1X
VT-VETSY-1-1X
MESAP 43650
VT Patch Cord
MDSD
监控模块
VT-MUXA2-2-1X
连接插头和电缆线组
用于带连接器 K4 的阀
用于带连接器 4 极的阀
用于带圆形连接器的阀门
用于带连接器 K14 的机械压力开关
用于带连接器 K24、K35 和 K72 的阀和传感器
用于与连接器 K6 和 DK6L 对中连接的机械位置开关、压力开关和阀
用于带连接器 C4 和 C4Z 的方向阀
……
多病所需惟药物,微躯此外更何求。—— 唐·杜甫《江村》
Bosch Rexroth Electronics
博世力士乐电子元件
阀放大器型号:
0811405143 VT-SSPA1-525-20/V0/0
0811405145 VT-SSPA1-525-20/V0/I
0811405144 VT-SSPA1-508-20/V0/0
0811405162 VT-SSPA1-508-20/V0/I
0811405041 VT-SSPA 1-525-10/V0
0811405143 VT-SSPA1-525-2X/V0/0
0811405145 VT-SSPA1-525-2X/V0/I
0811405144 VT-SSPA1-508-2X/V0/0
0811405162 VT-SSPA1-508-2X/V0/I
0811405041 VT-SSPA 1-525-10/V0
0811405143 VT-SSPA1-525-2X/V0/0
0811405145 VT-SSPA1-525-2X/V0/I
0811405126 VT-MSPA 1-508-10/V0
0811405127 VT-MSPA 1-525-10/V0
0811405106 VT-MSPA 2-525-10/V0
0811405081 VT-VSPA 1-508-10/V0/RTP
0811405079 VT-VSPA 1-525-10/V0/RTP
0811405080 VT-VSPA 2-525-10/V0/RTP
0811405006 VT-VRPA1-500-20/V0
0811405025 VT-VRPA 1-515-20/V0/T2
0811405095 VT-VRPA 1-527-10/V0
0811405096 VT-VRPA 1-527-10/V0/PV
0811405101 VT-VRPA 1-527-10/V0/PV-RTP
0811405098 VT-VRPA 1-527-10/V0/QV
0811405103 VT-VRPA 1-527-10/V0/QV-RTP
0811405100 VT-VRPA 1-527-10/V0/RTP
0811405176 VT-VRPA1-527-1X/V0/PV-RTS
0811405177 VT-VRPA1-527-1X/V0/QV-RTS
0811405175 VT-VRPA1-527-1X/V0/RTS
0811405076 VT-VRPA 1-527-20/V0/2/2V
0811405074 VT-VRPA 1-527-20/V0/RTS-2/2V
0811405073 VT-VRPA 1-527-20/V0/RTS-2STV
0811405097 VT-VRPA 1-537-10/V0/PV
0811405102 VT-VRPA 1-537-10/V0/PV-RTP
0811405099 VT-VRPA 1-537-10/V0/QV
0811405104 VT-VRPA 1-537-10/V0/QV-RTP
0811405179 VT-VRPA1-537-1X/V0/PV-RTS
0811405178 VT-VRPA1-537-1X/V0/QV-RTS
0811405062 VT-VRPA 1-537-20/V0
0811405078 VT-VRPA 1-542-10/V2
0811405119 VT-VRPA 2-527-10/V0/RTP
0811405137 VT-VRPA 2-527-10/V0/RTS
0811405120 VT-VRPA 2-537-10/V0/RTP
0811405138 VT-VRPA 2-537-10/V0/RTS
0811405123 VT-VRRA 1-527-10/V0
0811405148 VT-VRRA 1-527-10/V0/RV
0811405060 VT-VRRA 1-527-20/V0
0811405032 VT-VRRA 1-527-20/V0
0811405063 VT-VRRA 1-527-20/V0/2STV
0811405065 VT-VRRA 1-527-20/V0/K40-AGC
0811405068 VT-VRRA 1-527-20/V0/K40-AGC-2STV
0811405066 VT-VRRA 1-527-20/V0/K60-AGC
0811405069 VT-VRRA 1-527-20/V0/KV-AGC
0811405064 VT-VRRA 1-527-20/V0/PO-IS
0811405061 VT-VRRA 1-537-20/V0
0811405067 VT-VRRA 1-537-20/V0/K40-AGC
0811405070 VT-VRRA 1-537-20/V0/KV-AGC
0811405083 VT-KRRA 2-527-20/V0/2CH
0811405082 VT-KRRA 2-537-20/V0/
……
 
Bosch Rexroth Electronics
博世力士乐电子元件
阀放大器型号:
R900779643 VT-SSPA1-1-1X/V0/0-24
R901238534 VT-SSPA1-1-1X/V0/0-24/K24
R901024331 VT-SSPA1-5-1X/V0/0-24
R901238530 VT-SSPA1-5-1X/V0/0-24/K24
R901005414 VT-SSPA1-50-1X/V0/0-24
R901336728 VT-SSPA1-50-1X/V002/0-24
R901238532 VT-SSPA1-50-1X/V0/0-24/K24
R901030116 VT-SSPA1-100-1X/V0/0-24
R901238528 VT-SSPA1-100-1X/V0/0-24/K24
R901104644 VT-SSPA1-150-1X/V0/0-24
R901263782 VT-SSPA1-150-1X/V0/0-24/K24
R901241656 VT-SSPA1-1X/M12/1/V00
R901241651 VT-SSPA1-1X/M12/2/V00
R900779643 VT-SSPA1-1-1X/V0/0-24
R901238534 VT-SSPA1-1-1X/V0/0-24/K24
R901029782 VT-SSPA1-1-1X/V0/I-24
R901110449 VT-SSPA1-1-1X/V001
R901238528 VT-SSPA1-100-1X/V0/0-24/K24
R901238529 VT-SSPA1-100-1X/V0/I-24/K24
R901104644 VT-SSPA1-150-1X/V0/0-24
R901263782 VT-SSPA1-150-1X/V0/0-24/K24
R901238530 VT-SSPA1-5-1X/V0/0-24/K24
R901005414 VT-SSPA1-50-1X/V0/0-24
R901238532 VT-SSPA1-50-1X/V0/0-24/K24
R901029783 VT-SSPA1-50-1X/V0/I-24
R900702060 VT-MSPA1-1-1X/V0/0
R901142355 VT-MSPA1-10-1X/V0
R901142360 VT-MSPA1-11-1X/V0/0
R901288142 VT-MSPA1-150-1X/V0/0
R901142366 VT-MSPA1-200-1X/V0/0
R901288145 VT-MSPA1-30-1X/V0/0
R900249810 VT-MSPA1-50-1X/V0
R901054016 VT-MSPA1-50-1X/V001
R901010980 VT-MSPA2-1-1X/V0/0
R901348140 VT-MSPA2-1-1X=V0/0
R901061664 VT-MSPA2-200-1X/V0/0
R900546949 VT 11113-1X/
R900537344 VT 11131-1X/
R900030647 VT 11132-1X/
R901197784 VT-MSRA1-1-1X/V0/0
R900033823 VT-VSPA1-1-1X/
R900916996 VT-VSPA1-1-1X/001
R900934742 VT-VSPA1-1-1X/002/15SEC
R900934743 VT-VSPA1-1-1X/002/30SEC
R900934744 VT-VSPA1-1-1X/002/60SEC
R900940278 VT-VSPA1-1-1X/003/4-20MA/450MA
R900966500 VT-VSPA1-1-1X/004
R900978827 VT-VSPA1-1-1X/005
R900050543 VT-VSPA1-1-1X/V1
R901152628 VT-VSPA1-10-1X/V0/0
R901152637 VT-VSPA1-11-1X/V0/0
R900782310 VT-VSPA1-2-1X/V0/0
R901002761 VT-VSPA1-2-1X/V0/A4
R900053778 VT-VSPA1K-1-1X/
R900934739 VT-VSPA1K-1-1X/002/15SEC
R900934740 VT-VSPA1K-1-1X/002/30SEC
R900934741 VT-VSPA1K-1-1X/002/60SEC
R900782311 VT-VSPA1K-2-1X/V0/0
R901002766 VT-VSPA1K-2-1X/V0/A4
R900021909 VT-VSPA2-1-1X/T1
R900914515 VT-VSPA2-1-1X/T1-001
R900931387 VT-VSPA2-1-1X/T1-002
R900736705 VT-VSPA2-1-1X/T1-003
R900029790 VT-VSPA2-1-1X/T5
R900931388 VT-VSPA2-1-1X/T5-002
R901002090 VT-VSPA2-1-2X/V0/T1
R901002095 VT-VSPA2-1-2X/V0/T5
R900214081 VT-VSPA2-50-1X/T1
R900955071 VT-VSPA2-50-1X/T1-001
R900955923 VT-VSPA2-50-1X/T1-002
R900214082 VT-VSPA2-50-1X/T5
R900924234 VT 17193-1X/ (MOD VT-VSPA1-1/RA.60SEC)
R900924236 VT 17194-1X/ (MOD.VT-VSPA1-1-1X/)
R900927289 VT 17258-1X/ (MOD.VT-VSPA1-1-1X/)
R900948507 VT 17303-1X/ (MOD.VT-VSPA1-1-1X/475HZ)
R901024113 VT 17385-1X/ (MOD.VT-VSPA1-1-1X/)
R900033828 VT 2000-5X/
R901077297 VT-VSPD-1-2X/V0/0-0-1
R901161533 VT-VSPD-1-2X/V0/1-0-1
R901009038 VT-VRPA1-100-1X/V0/0
R901057058 VT-VRPA1-150-1X/V0/0
R901057060 VT-VRPA1-151-1X/V0/0
R900952202 VT-VRPA1-50-1X/
R901053629 VT-VRPA1-50-1X/002
R900952204 VT-VRPA1-51-1X/
R900952205 VT-VRPA1-52-1X/
R900979887 VT-VRPA2-1-1X/V0/T1
R900979885 VT-VRPA2-1-1X/V0/T5
R900966857 VT-VRPA2-1-1X/V0/T5-M/
R900979889 VT-VRPA2-2-1X/V0/T1
R900979888 VT-VRPA2-2-1X/V0/T5
R901024832 VT 17384-1X/ (MOD.VT-VRPA1-50-1X)
R900552971 VT 4437-2X/ (VT-VRPA1-150-1X/V0/0)
R900752430 VT-MRMA1-1-1X/V0/0
R901094750 VT-MRPA1-1-1X/V0/0
R900779644 VT-MRPA1-100-1X/V0/0
R901080965 VT-MRPA1-150-1X/V0/0
R901080966 VT-MRPA1-151-1X/V0/0
R901094751 VT-MRPA1-2-1X/V0/0
R900249895 VT-MRPA2-1-1X/V0/0
R900249811 VT-MRPA2-2-1X/V0/0
R900067617 VT-VRM1-1-1X/
R901066987 VT-VRPD-2-2X/V0/0-0-1
R901288142 VT-MSPA1-150-1X/V0/0
R900579497 VT 5035-1X/
R927001475 VT-VRRA1-527-2X/V0/K40-AGC
R901205756 VT-VRRA1-527-2X/V001
R900019567 VT 11021-1X/
R901167581 VT 11021-1X/V001
R901272388 VT 11021-1X/V002
R901335573 VT 11021-1X=
R900930246 VT-SR1-1X/0/001
R900031497 VT-SR1-1X/0/4WRD10-3X
R900033120 VT-SR1-1X/0/4WS2EE10
R900066850 VT-SR2-1X/0
R900976645 VT-SR2-1X/0-100
R900033111 VT-SR2-1X/0-60
R900976646 VT-SR2-1X/1-100
R900938817 VT-SR2-1X/1-60
R900020109 VT-SR2-1X/1/4WS2EM10
R900970094 VT-SR11-1X/1/001
R900903534 VT-SR11-1X/1/4WRD10-5X
R900578547 VT-SR11-1X/1/4WRD16-5X
R900926329 VT-SR11-1X/1/4WRD25-5X
R900727296 VT-SR11-1X/1/4WRD32-5X
R900903719 VT-SR11-1X/1/4WRD52-5X
R900959635 VT-SSV-1-2X/
R901363049 VT-SSBA1-PWM-1X/V001/15
R901265633 VT-SSBA1-PWM-1X/V001/5
R901354308 VT-SSBA1-PWM-1X/V002/10
R901354307 VT-SSBA1-PWM-1X/V002/15
R901290194 VT-SSBA1-PWM-1X/V002/5
……
有病固当攻以药石,然不若调饮食,使日中二餐如意,乃康济上策也。—— 宋·李光《十四与赵元镇书》
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