下列叙述正确的是( ) A．H2O的摩尔质量为18g B．H+的摩尔质量是1g_爱下问搜题

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问题选择题

下列叙述正确的是( )

A．H₂O的摩尔质量为18g

B．H⁺的摩尔质量是1g/mol

C．1mol 氢气的质量为2g/mol

D．水的相对分子质量是18g/mol

答案

答案：B

选择题

191. The hotel was very different from what the advertisement us to expect. We found that its conditions were terrible.

A．made

B．shown

C．led

D．Told

问答题简答题

简述油气藏形成的基本条件。