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问题 单项选择题

用箕斗升降物料时的速度，一般不大于（）m/s。

A.9

B.7

C.5

答案

参考答案：B

完形填空
完形填空。
    This boy's name is _1_. He _2_ twelve. This is _3_ school. _4_ teacher is Miss Yang. _5_ a good
teacher.
    Jim has _6_ good friend _7_ school. His name _8_ Zhang Lin.
    They're _9_ Class 2, Grade 7. They are the best students in _10_ class.
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名词解释

亚文化
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