题目:
He was inspired to start again _________ he had failed.
A.where
B.in which
C.when
D.what
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:标准状况下该气体的体积是4.48L,所以气体的物质的量是4.48L÷22.4L/mol=0.2mol。则根据n=m/M可知,该气体的摩尔质量是M=14.2g÷0.2mol=71g/mol,答案选D。点评:在进行物质的量的有关计算...