RIEGLER 调节阀 482.20 B 标准型号 Wagner FDX25压力计
RIEGLER 调节阀 482.20 B 标准型号 Wagner FDX25压力计——新入库产品有:ITALVIBRAS 电机 、PENNY+GILES电位器
Discom BKS03/KS91D传感器WAIRCOM URG4/10电磁阀
Discom BKS03/KS91D传感器WAIRCOM URG4/10电磁阀
Discom BKS03/KS91D传感器WAIRCOM 50P125+270 XT/M
Discom BKS03/KS91D传感器WAIRCOM 50P125+270 XT/M
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器WAIRCOM
Discom BKS03/KS91D传感器VIVOIL X1U1642DBBA齿轮泵
Discom BKS03/KS91D传感器VIVOIL X1U1642DBBA齿轮泵
Discom BKS03/KS91D传感器VITEC 438A 振动开关
Discom BKS03/KS91D传感器VITEC 438A 振动开关
Discom BKS03/KS91D传感器Vishay GLI 1800-2***电容SITEMA
Discom BKS03/KS91D传感器Vishay GLI 1800-2***电容SITEMA
Discom BKS03/KS91D传感器Vishay GLI 1800-2***电容ROEMHELD
Discom BKS03/KS91D传感器Vishay GLI 1800-2***电容ROEMHELD
【工业知识
电工基本知识——什么叫大地
当电气设备发生接地故障时,接地电流就通过接地线和接地体流入地下,并向在地做半球形疏散。在靠近接地体的地方,半球面较小,电阻大,接地电流通过此处的电压降也大,其电位就高;在距离接地体较远的地方,半球面较大,电阻小,电压降也小,其电位也就低。以接地体为圆心,球形的半径约20m,其电位实际趋近于零,一般称为大地或地。