【单选题】【消耗次数:1】
By the end of last month, she ____ over five hundred letters of congratulation from different parts of the world.
would received
has received
had received
receive
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相关题目
【单选题】 By the end of last month, she _____ over five hundred letters of congratulation from different parts of the world.
①  would received
②  has received
③  had received
④  receive
【单选题】 20. He has received many presents from admirers, from the_____ to the valueless..
①  precious
②  expensive
③  priceless
④  cheap
【单选题】 It wasn’t until nearly a month later ___ I received the manager’s reply.
①  since
②  when
③  as
④  that
【单选题】 It’s quite different from _____ I read last month.
①  that
②  which
③  the one
④  the one what
【单选题】 Frank almost never received any education, ____?
①  would he
②  did he
③  didn’t he
④  wouldn’t he
【单选题】 A: I havent received the book which I ordered from you last Saturday. B: Please tell me the serial number on your order sheet. [填空].
①  You wont regret
②  Trust me
③  Ill run a check for you
④  I promise
【单选题】 ____ these honors he received a sum of money.
①  Except
②  But
③  Besides
④  Outside
【单选题】 _______ these honours he received a sum of money.
①  Besides
②  Outside
③  But
④  Except
【判断题】 By?the end of last month, he?had learned?three thousand new words.
①  正确
②  错误
【单选题】 The speaker, _______ for her splendid speeches, was warmly received by the audience.
①  having known
②  being known
③  knowing
④  known
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【单选题】 对三极管放大作用的实质,下面说法正确的是
①  三极管可以把小能量放大成大能量
②  三极管可以把小电流放大成大电流
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【单选题】 为使集成运放工作在线性区,电路中应引入
①  正反馈
②  电压反馈
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【单选题】 由理想集成运放的电压放大倍数Aod=∞,可得ui=u+-u-=0。说明运放输入端
①  短路
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③  相当于短路   
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①  P区接电源负极,N区接电源正极
②  P区接电源正极,N区接电源负极
③  P区和N区都接电源负极
④  P区和N区都接电源正极
【判断题】 在交流电路中,为了研究多个同频率正弦量之间的关系,常常选择其中的一个作为参考,称为参考正弦量。
①  正确
②  错误
【单选题】 正弦电流i=100sin(ωt+70°),则此电流的初相角为
① 
②  20°
③  100°
④  70°
【判断题】 世界各国使用的交流电都是一样的50Hz、220V。
①  正确
②  错误
【单选题】 正弦波的最大值是有效值( )倍。
①  1
②  1.414
③  1.732
④  2
【判断题】 我国使用的交流电频率为60Hz。
①  正确
②  错误
【判断题】 正弦量的初相角与起始时间的选择有关,而相位差则与起始时间无关。
①  正确
②  错误