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【单选题】
四冲程发动机完成一个工作循环,曲轴与凸轮轴所转圈数比是()。
A.
1 ∶ 1
B.
1 ∶ 2
C.
2 ∶ 1
D.
3∶ 1
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【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】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
【简答题】The English Renaissance is a period during which______introduced the Petrarchan sonnet into England.
【判断题】( )ARP协议的作用是由IP地址求M AC地址,它的办议数据单元封装在IP分组中传送
A.
正确
B.
错误
【单选题】低音提琴比其他弓弦乐器更多地用( ),这一特点使得它除了在管弦乐队中的扮演角色外也在歌舞乐队和爵士乐队中成为重要的节奏乐器。
A.
泛音
B.
揉弦
C.
空弦
D.
拨奏
【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
【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.
V
B.
V
C.
V
D.
V
【简答题】Explain the 'Puritanism' during the English Revolution.
【简答题】 During the summer of 2009,I started reading books in English,mostly stories.I would learn a lot of new                                      1. words from these books,but I had terribly problems     ...
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