热电阻元件在使用中会发生哪些常见故障?
参考答案:
热电阻线之间短路接地;电阻元件电阻丝断;保护套管内部积水,电阻元件与导线连接松动或断开。
I have to go to work by taxi because my car __________ at the garage.[ ]
A. will be repaired
B. is repaired
C. is being repaired.
D. has been repaired.
两合同型号的离心泵并联工作时,总流量等于().
A.两泵流量的1/2
B.两泵流量之差
C.两泵流量之和
D.两泵流量的比值