题目内容

在纵波中,某时刻两个“疏部”或“密部”之间的距离等于一个波长。

A. 对
B. 错

查看答案
更多问题

Sure, we can help you plan for a _________ ________.

Do you have any preferences, I mean, what interests you more, ____ __or places of ____ __?

That’s right. I was told the best time to visit Tibet is in the ________, October might be a bit __________ _________.

With its ____ __and ____ __, China has lots of places of interest for tourists.

答案查题题库