表示阿伏加德罗常数的值。下列说法正确的是_刷题宝

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表示阿伏加德罗常数的值。下列说法正确的是

A：在铜和稀硝酸的反应中，当转移个电子时，产生气体的体积约为11.2L

B：常温常压下，所含的原子数为3.5

C：标准状况下，0.5个分子所占的体积约为11.2L

D：常温常压下，将0.5molHl气体和0.5molCl₂混合后，气体的分子总数为

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B

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_________is known to us all is that the old writer, for __________ life was hard in the past, still works very hard in his eighties.

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补全对话。

A. I like drawing cartoons.

B. Why not?

C. I'm writing an email to my pen pal, Dale.

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Alan:____But he likes cooking Chinese food.

Zhang Li: I like Chinese food, too. Can I also be his pen pal?

Alan: Sure.____

Zhang Li: Cool!

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有一根长150米的空心钢管，甲同学在一端敲打钢管一下，乙同学在钢管的另一端可以听到几次响声（）

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