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【单选题】
计数译码显示实验中，用同步置零法连线时，74LS161计数器预置数据输入端D~A正确的接线是 。A.
均悬空
B.
均接地
C.
均接高电平
D.
以上都不对
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【单选题】It's fr eezing outside. You _______ put on your overcoat. [ ]
A.
had better to
B.
had better
C.
would better
D.
would better to
【单选题】The new type of computer ________ better if it is advertised on TV.
A.
will sell
B.
sells
C.
would sell
D.
will be sold
【简答题】According to the letter, the Indians believed that ________. A) it would be better for their boys to receive some schooling B) they were being insulted by the offer C) they knew more about science tha...
【简答题】断路器的“跳跃”现象一般是在跳闸、合闸回路同时接通时才发生。防跳回路的设计应使得断路器出现跳跃时将断路器闭锁到跳闸位置。()
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