皮皮学，免费搜题
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搜题
【单选题】
空气锤的工作原理是电动机通过减速器带动( ),使压缩活塞在压缩缸中做上下往复运动。A.
摩擦盘
B.
曲柄连杆机构
C.
曲柄滑块机构
D.
飞轮
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举一反三
【简答题】Watch the video and answer the following questions. 1. What's the building that was hit?
【简答题】Watch the video clip and try to answer the following questions: 1. What are these women’s reaction? 2. What is the theme of this video clip?
【单选题】Read the text below the video. Then watch the video. Read each question and choose the correct answer. 1. Susan Wu is __________.
A.
Laura's friend
B.
a new co-worker
C.
Laura's sister
【简答题】Watch the video clip and answer the
questions. 1.
According to the video clip, which city is the greenest one in Asia?
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