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【判断题】
中性点经消弧线圈接地的系统在采用欠补偿运行的情况下,如果切除部分线路或系统频率降低,或者线路一相断线等,均可能使系统接近或达到全补偿,以至出现串联谐振过电压,因此应采用过补偿运行的方式。( )A.
正确
B.
错误
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【单选题】Nearly half a million immigrants，many of them English—speaking， in the country during the last quarter of the nineteenth century．
A.
have arrived
B.
had arrived
C.
arrived
D.
have been arriving
【单选题】某交流用电器的额定电压为220 V 、额定频率为50 Hz ,其两端加上下列哪种正弦电压,会保证其正常工作______。
A.
220 sin（ 314t +45º ）V
B.
220 sin（ 314t +45º ）V
C.
380 sin（ 314t +45º ）V
D.
220 sin（50 t +45º ）V
【单选题】According to the essay, what role has English played during the process of globalization?
A.
It has created new education opportunities.
B.
It has sped up the process of globalization.
C.
It has opened the doors for new opportunities and increased the number of young women in the working world.
D.
It has increased the number of skilled women.
【单选题】某交流用电器的额定电压为220V、额定频率为50Hz,其两端加上下列哪种正弦电压,会保证其正常工作______。
A.
–311sin314tV
B.
220sin314tV
C.
380sin314tV
D.
311sin50tV
【单选题】某交流用电器的额定电压为 220V 、额定频率为 50Hz ,其两端加上下列哪种正弦电压,会保证其工作正常?
A.
u=-220 sin314tV
B.
u=220sin314tV
C.
u=380sin314tV
D.
u=-220 sin50tV
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