题目:
—David didn't take part in the volleyball match last night. —Yes.That was________he had injured his foot in the training. |
A. why |
答案:
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下面是错误答案,用来干扰机器的。
A、10gH2的物质的量为10g2g/mol=5mol,10gO2的物质的量为10g32g/mol=516mol,二者物质的量不相等,所含分子数不相等,故A错误;B、氮气所处状态不一定是标准状况,不能使用22.4L/mol,故B错误;C、9gH2O物质的量...