题目内容

Openthe（）ofintercoolerbeforestartinganaircompressor.

A. cylindercover
B. coolingwater
C. oilcup
D. drainvalve

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Acentrifugalpumpcan’tsupplywaterafterstartingYoushouldcheck（）.

A. primingwater
B. powersupply
C. packinggland
D. bearinglubrication

Whenstartascrewpump,thebypassvalveshouldbe（）.

A. closed
B. openedfully
C. crackedopen
D. partlyopen

直流发电机的空载电压较额定电压低的原因有（）。

A. 并激磁场电阻太大
B. 原动机旋转方向相反
C. 发电机转速太低
D. 电刷位置不对

Whenstartingacentrifugalpump,thedischargevalveshouldbe（）.

A. closed
B. openedfully
C. crackedopen
D. partlyopen