题目:
The church was built ______ a Roman temple had once been located.
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答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:12g12C含有的碳原子数叫阿佛加德罗常数,A错误;摩尔质量单位为g/mol,B错误;标准状况下,1mol任何气体的体积都约是22.4L,D错误。点评:6.02×1023是阿佛加德罗常数的近似值。