离心式泵在定转速下运行时,为了避免启动电流过大,通常在什么情况下启动?
参考答案:
离心式泵在定转速下运行时,为了避免启动电流过大,通常在阀门全关的情况下启动。
DSL参数指标有最大可用速率,(),噪声容限,线路衰减,链路告警五种。
It's a bad habit to ___ breakfast every day. A healthy breakfast is very important for all of us. [ ]
A. cut off
B. leave out
C. put away
D. make up