TTL与非门电路的标准输入低电平()V。 A.0.1 B.0.2 C.0.3 D.0

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问题:

TTL与非门电路的标准输入低电平()V。

A.0.1

B.0.2

C.0.3

D.0.4

考点:矿井维修电工矿井维修电工(高级)矿井维修电工(高级)题库
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Everybody dreams. Some people think dreams can tell us about the future. Other people think dreams can tell us about ourselves. It’s like our (11) is talking to us.

Why are dreams (12) strange and hard to understand Some people think our brain uses (13) to talk to us. When we fly, swim, or fall down in our dreams, it has a (14) meaning. Lots of doctors help people (15) their dreams. They find that dreams tell us about our (16) and fears.

These days, many scientists (17) that dreams are very important. During the day, we have many (18) , and our brain receives a lot of information. When we dream, our brain (19) information that is not important, and puts the most important information into our (20) . As we learn more about the brain, we may find answers to our questions about dreams.

17().

A.reply 

B.believe 

C.doubt 

D.worry

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移动用户的忙时话务量为()Erl。

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可直接产生45--65Hz左右的低频正弦波信号的振荡器是()。

A、文氏电桥振荡器

B、变压器反馈式LC振荡器

C、三点式LC振荡器

D、晶振

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下巴的表情中,耷拉下巴多表示困乏。()

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腻子不具有的特性是()。

A、填平性

B、刮涂性

C、干燥性

D、收缩性

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