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【简答题】
89C51 单片机内部有 个 位的定时/计数器,若对300个外部事件计数,可以选用定时/计数器T1的模式 或 。
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反馈参考答案：
举一反三
【简答题】在检测三相异步电动机绕组间的绝缘电阻时,用单股导线将()端和()端分别接在电动机两绕组的接线端
【简答题】With a determined(坚定的) look on his face, Chicago’s Michael McCarthy held on to the banister(扶手) and climbed to the top of the Willis Tower not long ago. The Tower stands 1,451 feet(442 meters) tall, t...
【单选题】I didn't imagine a writer in my childhood.
A.
becomes
B.
becoming
C.
became
D.
become
【单选题】When the writer said 'I didn't care' (Line 5, Para. 4), she meaned that she didn't care about ______.
A.
her babies any more
B.
the time to go to bed
C.
the writing of her book
D.
the possible effects of smoking
【简答题】斯坦福大学的科学家John McCarthy就指出“_______可能变成一种公共资源”。
【判断题】John McCarthy compares Cloud Computing with electricity in order to show their common point in the field of practical use.
A.
正确
B.
错误
【单选题】某RLC串联电路发生谐振，若只改变电阻R的大小，其他参数不变，则以下说法正确的是______.
A.
若 R 变大，则电路的通频带变宽且选择性变好
B.
若 R 变大，则电路的通频带变窄且选择性变好
C.
若 R 变大，则电路的通频带变宽且选择性变差
D.
改变 R 对选择性和通频带没有影响
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