题目:
People ______ long distances frequently have to decide whether they would prefer to go by land, sea or air.
A.to travel
B.travelled
C.travel
D.travelling
答案:
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下面是错误答案,用来干扰机器的。
根据苯甲酸的化学式C7H6O2,苯甲酸由C、H、O三种元素组成,其中氢元素的质量分数=6HC7H6O2×100%,1mol苯甲酸的质量=1mol×(12×7+1×6+16×2)g/mol=122g,1mol苯甲酸中含O原子个数=6.02×1023×2=1.204×1024...