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搜题/搜资源
【单选题】【消耗次数:1】
The boy and his mother were ____ in the burning house.
①
involved
②
trapped
③
enclosed
④
surrounded
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【单选题】
He asked his neighbour to ________ his house.
①
keep an eye on
②
keep their eyes on
③
keep their eyes open
④
keep them eyes open
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【单选题】
His mother _____alone since his father died.
①
lived
②
lives
③
has lived
④
is living
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【单选题】
The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.
①
had they been done
②
they had been done
③
having been done
④
they were done
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【单选题】
The millions of calculations involved, ____ by hand, would have lost all practical value by the time they were finished.
①
had they been done
②
they had been done
③
having been done
④
they were done
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【单选题】
The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.
①
had they been done
②
they had been done
③
having been done
④
they were done
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The boy _______ his hands just now.
①
was washing
②
is washing
③
washes
④
washed
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【单选题】
There were two small rooms in the house, _______ served as a bathroom.
①
the smaller of which
②
the smallest of which
③
the smallest of them
④
smallest of that
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【单选题】
There were two small rooms in the house, _______ served as a bathroom.
①
the smallest of which
②
the smallest of them
③
the smaller of which
④
smallest of that
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【单选题】
Dave ____ into the house without ____ out by his parents.
①
slipped; finding
②
slips; finding
③
slips; to be found
④
slipped; being found
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【多选题】
Tom_____________ a letter from his mother yesterday.
①
got
②
accepted
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bought
④
received
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【单选题】
直流发电机由主磁通产生感应电动势的有
①
电枢绕组
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电枢绕组和励磁绕组
③
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额定电压为220/110V的单相变压器,低压边漏电抗为0.075,折合到一次侧为:
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0.075
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0.15
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0.3
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直流电机电枢反应导致合成磁密为零的地方偏离了空载时的()
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磁极中心线上
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物理中性线上
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几何中性线上
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由公式可知,电磁转矩与转子电流成正比,因为直接起动时的起动电流很大,所以起动转矩也很大。
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正确
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异步电动机的转子是鼠笼式的。
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电压互感器在工作中,副方不能短路。
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若要改变并励直流发电机的电枢两端的正负极性,则应:
①
改变励磁绕组的接线或改变电枢绕组的接线
②
改变原动机转向
③
既改变原动机转向又改变励磁绕组接线
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【单选题】
与固有机械特性相比,人为机械特性上的最大电磁转矩减小,临界转差率没变,则该人为机械特性是异步电动机的:()
①
定子串接电阻的人为机械特性;
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转子串接电阻的人为机械特性;
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降低电压的人为机械特性。
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【判断题】
不论变压器的负载性质如何,变压器的外特性曲线U2=f(I2)总是一条下降的曲线。
①
正确
②
错误
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【判断题】
对称三相负载作星形连接时,线电流等于相电流,线电压等于相电压。
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正确
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错误
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