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【单选题】
液压提速道岔在尖轨第一、第二牵引点间任意一处,尖轨与基本轨间插入( )mm厚、20mm宽的铁板,不得接通密贴检查器或转辙机内的表示接点。A.
4
B.
2
C.
5
D.
10
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举一反三
【单选题】Nearly half a million immigrants，many of them English—speaking， in the country during the last quarter of the nineth 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 50Hz ,其两侧应加上 ________ 电压,方能保证用电器的正常工作。
A.
220 sin314t (V)
B.
220 sin50t (V)
C.
220√2 sin314t (V)
D.
220 √2 sin50t (V)
【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】It was during ______ when the English navy defeated the Spanish Armada.
A.
the Middle Ages
B.
the 16th century
C.
the Elizabethan age
D.
the Wars of the Roses
【单选题】Which of the following is not the French word borrowed into English during the Middle Ages?
A.
sergeant
B.
battle
C.
spy
D.
fight
【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
【简答题】The English Renaissance is a period during which______introduced the Petrarchan sonnet into England.
【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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