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【简答题】
（）功率的单位是瓦特，（）功率的单位是乏尔，视在功率的单位是伏安。
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皮皮学刷刷变学霸
举一反三
【单选题】Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
A.
why
B.
that
C.
when
D.
ours
【单选题】Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom.
A.
why
B.
that
C.
when
D.
where
【单选题】静压轴承的工作原理是 ,再经过间隙流回油池。
A.
压力油经过一个节流器分别流入轴承的一个油腔
B.
压力油经过四个节流器分别流入轴承的四个油腔
C.
压力油经过一个节流器分别流入轴承的四个油腔
D.
压力油经过一个节流器分别流入轴承的两个油腔
【简答题】Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom. A．why B．that C．when D．ours1
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