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第1题

有一台六极三相绕线式异步电动机，在f=50Hz的电源上带额定负载运行，其转差率为0.02，电动机的同步转速为
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第2题

_from the top of the building, the whole city looks very beautiful. B. Saw A. See C. Seeing D. Seen
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第3题

Keith doesn.t like the king-size bed his wife bought the other day because it takes_too much space. A.up B.in C.on D.aw
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第4题

The teacher used a microphone_his voice could reach the back of the rogm. A.so asB.i C. so thatD.as that
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