一架天平称量是200g，则它不能称量200mL的是（）（ρ酱油＞ρ

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问题选择题

一架天平称量是200g，则它不能称量200mL的是（　　）（ρ_酱油＞ρ_水＞ρ_酒＞ρ_煤油＞ρ_汽油）

A．酱油

B．白酒

C．煤油

D．汽油

答案

200mL水的质量为200cm³×1g/cm³=200g．

因为酱油的密度大于水，其它液体的密度小于水，由公式m=ρV知，200mL的酱油质量大于200g，其它液体的质量小于200g．

而天平的称量是200g，所以不能称量200mL的酱油．

故选A．

补全对话，情景问答

看图完成对话。

1. A: What's this in English?

B : It's _____.

A: And what are these?

B: They are _____ .

2. A: Wht's that in English?

B : It's _____.

A: And what are those? Are those buses?

B. No, They are _____ .

3. A: What's this in English?

B : It's _____.

A: And what are these?

B: They are _____.

4. A: What's this in English?

B: _____ an egg

A: And what are _____?

B: _____ are _____

5. A: What's that in English?

B: _____ a cake.

A: And what are _____? Are those cakes?

单项选择题

对违反纪律构成犯罪的人民警察，按照( )规定，依法给予刑事处罚。

A．人民警察法

B．刑法

C．刑事诉讼法

D．治安管理处罚法