柴油发电机组安装质量控制要点:受电侧低压配电柜的开关设备、自动或手动切换装置和保护装置等试验合格,应按设计的自备电源使用分配预案进行负荷试验,机组连续运行( )无故障。
A. 8h
B. 10h
C. 12h
D. 24h
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碱性蓄电池,配制好的电解液应静置( ),使其澄清后使用。
A. 1h
B. 2h
C. 3h
D. 4h
The reason for his failure is ______ he didn't work hard.
A. that
B. as
C. since
D. because
Mary is in bed with a fever and she can't hope to ______ the cold in a few days.
A. get over
B. get away
C. get off
D. get out
对于UPS电源中的逆变器,不是简单地将直流变成交流,尚需实现( )电压的自动调节。
A. 输入
B. 输出
C. 波形
D. 特定