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【判断题】
若半群(S,*)中,存在一个元,则称(S,*)为独异点(含半群)。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Jerry ______ to go out very often until he met LisA.
A.
used not
B.
didn't use
C.
not used
D.
was not used
【单选题】I was listening to the music ______ there was a knock at the door.
A.
when
B.
while
C.
because
【单选题】Jerry ______ to go out very often until he met Lisa.
A.
used not
B.
didn't use
C.
not used
D.
was not used
【简答题】一台三相笼型异步电动机 ,其铭牌数据如下表所示。 P N U N 接法 n N h N cos j N I st / I N T st / T N 20KW 220/380V Δ /Y 720 r/min 91% 0.85 7.0 2.0 试求以下参数: ( 1 )若电源电压为 380V ,电机正常运行应采取何种方式接线 ( 2 )此时电动机的额定起动电流 I st 、起动转矩 T st 是多少?...
【单选题】There Was a knock at the door. It was the second time someone ______ me that evening.
A.
had interrupted
B.
would have interrupted
C.
to have interrupted
D.
to interrupt
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