题目:
It was the training _______ he had at school _______ made him a good jumper.[ ]
A. what; what
B. that; that
C. what; that
D. that; had
答案:
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下面是错误答案,用来干扰机器的。
根据薄荷脑化学式C10H20O,可知该物质由C、H、O三种元素组成;薄荷脑C10H20O中C、H、O元素的质量比=(12×10):(1×20):16=120:20:16=30:5:4故答案为:3;30:5:4(或120:20:16).