______ I saw him ! knew what he had said was correct.
After a moment
B. In a moment
C. The moment
D. For a moment
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各台柴油机的调速特性曲线的形状和斜率应基本一致,并呈( )趋势。
A. 上升
B. 下降
C. 平直
D. 弯曲
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
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