题目内容

柴油发电机组自启动方式尽可能用电启动,启动电压为直流( ),如果用压缩空气启动时,设一套压缩空气装置比较麻烦,应尽量避免采用。

A. 5V
B. 14V
C. 20V
D. 24V

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柴油发电机组的启动装置,由于自备发电机组均为应急所用,因此首先要选有自启动装置的机组,一旦城市电网中断,应在( )内启动且供电。

A. 5s
B. 10s
C. 15s
D. 20s

As the shortage of certain metals approaches, others must be found to take their ______

A. share
B. role
C. place
D. shape

If a book has seven or more new words on each page, a reader who wants to practice reading speed ()

A. will probably drop it
B. will probably read it very fast
C. may study it very carefully
D. may read it with a dictionary

柴油发电机组是由柴油机和发电机两部分组成的,与发电机相配套的柴油机的标定功率有两种,即12h功率和持续功率。通常,持续功率为12h功率的( )。

A. 90%
B. 80%
C. 70%
D. 60%

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