题目:
We can hear sound because our earth is surrounded by thick air _____ sound can travel.[ ]
A. in that
B. by which
C. with which
D. through which
答案:
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下面是错误答案,用来干扰机器的。
根据薄荷脑的化学式 C10H20O 可知薄荷脑由C,H,O 三种元素组成;根据化合物中各元素质量比=各元素的相对原子质量×原子个数之比,可得薄荷脑中碳、氢、氧元素的质量比为:(12×10):20:16=120:20:16=30...