下列说法中正确的是 A．1molNaOH的质量是40g B．1molCH4体积约_爱下问搜题

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问题选择题

下列说法中正确的是

A．1molNaOH的质量是40g

B．1molCH₄体积约为22.4L

C．CO₂的摩尔质量为44g

D．1molH₂O中约含6.02×10²³个H

答案

答案：A

完形填空

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单项选择题

根据“十一五”规划，我国努力推进交通运输装备现代，争取到2010年，营运货车达到700万辆，力争重型货车、专用车辆、厢式货车的比例分别达到( )。

A．20%，30%和30%
B．30%，20%和30%
C．30%，30%和20%
D．30%，20%和20%