题目:
— _____ you were so late this morning?
— I forgot to set the alarm before going to bed last night. [ ]
A. Why
B. How come
C. How about
D. How
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:A选项,标况下,水是液态,无法根据体积求算物质的量;B选项, 1.06g Na2CO3晶体物质的量=C==0.01mol,含钠离子0.02mol,B正确;C选项,标准状况下,NA个CO2分子占有的体积为22.40L,C错误;D...