举例说明什么是直接测量及这种测量有何特点。

举例说明什么是直接测量及这种测量有何特点。

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熔断器是 。

熔断器是 。A.保护电器B.开关电器C.继电器的一种D.主令电器

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I think____ important to learn English well.( )(本题

I think____ important to learn English well.( )(本题3.0分) A、 this B、 that C、 it

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He tried to stand on his hands for five minutes, _

He tried to stand on his hands for five minutes, _______ is rather a difficult t

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极限 lim x→1 x2-2x+1/x2-1=( ) [ 2 分 ] A. 0 B. 1 C. 2

极限 lim x→1 x2-2x+1/x2-1=( ) [ 2 分 ] A. 0 B. 1 C. 2 D. 3

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