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【单选题】
过电流保护通常是指其启动电流按照躲开（）在整定的一种保护装置。它在正常运行时不应该启动，而在变压器外部故障时，则能反映于电流的（）而动作，在一般情况下作为变压器的后备保护。A.
最小负荷电流、减小
B.
最大负荷电流、增大
C.
最大负荷电流、减小
D.
最小负荷电流、减小
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举一反三
【单选题】He insisted that he _____ the best, so he insisted that he _____ the work all by himself. [ ]
A.
was; do
B.
be; do
C.
be; did
D.
had been; had done
【单选题】If he ___ that he ____ to work there, everything would be OK now.
A.
insisted, be sent
B.
insisted, was sent
C.
had insisted, be sent
D.
had insisted, was sent
【单选题】His father insisted _____ him, but he insisted he _____ nothing to do with the matter. [ ]
A.
on punishing; should have
B.
he punished; had
C.
on punishing; had
D.
he punish; should have
【单选题】He insisted that his bike ______ stolen and his wife insisted he ______ have to telephone the police. [ ]
A.
has been; would
B.
had; would
C.
was; should
D.
had been; should
【简答题】电动机反转的方法 只需改变电动机旋转磁场的旋转方向,即改变输入电动机三相电源的 ( ),也就数 改变电动机任意两根引线的连接相序。
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