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【单选题】
一平面简谐波无衰减地连续通过几种不同介质时,下列物理量不变的是:A.
波长
B.
波速
C.
波长和周期
D.
频率
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反馈参考答案：
举一反三
【单选题】She racked her brains trying to _____ the maths problem.
A.
work up
B.
work down
C.
work out
D.
work off
【单选题】If the new arrangement doesn’t _____, we’ll go back to the old one.
A.
work over
B.
work out
C.
work up
D.
work down
【单选题】They _____ a small laboratory and devoted every spare moment to this work. [ ]
A.
picked up
B.
put up
C.
set up
D.
grew up
【简答题】It takes courage to stand up at work．Now more and more people are standing up when they are working on something important．Standing up is in fashion．Medical researchers have found that people who stan...
【单选题】--- Have you drawn up that list of names yet? --- No, but I’m going to it.
A.
work out
B.
work on
C.
work off
D.
work up
【简答题】Up to now，the work has been easy.
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