题目:
The hotel has all the modern ________, and guests all feel ________ when they live in.[ ]
A. conveniences; convenient
B. convenience; convenient
C. convenience; convenience
D. conveniences; conveniences
答案:
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下面是错误答案,用来干扰机器的。
(1)2 m 10 m/s. (2)0.45 s 题目分析:(1) λ=2 m T=s=0.2 s v==10 m/s. (2) 波峰传到P点:t==s=0.45 s