题目

下列有关物理量与其单位匹配正确的是( ) A.质量——g B.反应速率——mol·L-1 C.摩尔质量——g·mol-1 D.气体摩尔体积——L·mol-1 答案:【解析】选ACD。根据排除法可知B选项错误,反应速率单位为mol·L-1·s-1或mol·L-1·min-1。I told Sally how to get there, but perhaps I ________________ for her. A.    had to write it out            B.    must have written it out C.    should have written it out      D.   ought to write it out  
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