题目内容

向心推力轴承同时能承受载荷和轴向载荷的共同作用。

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为了使角接触轴承能正常工作,一般这种轴承成对使用。

A. 对
B. 错

【简答题】歌曲风格大致分为几个类型？

在弹唱过程中，《学做解放军》分别需要用什么样的情感曲表述？

1.I end up getting my heart __. For so many years, I was never expressive with my feelings.A)hardenedB)hardeningC)hardensD)being hardened2.When boundaries between countries are not clearly _, there is usually trouble.A)differedB)definedC)made clearD)distinguished3.Water and air are basic _ to human beings. We can not live without them.A)materialsB)elementsC)essencesD)sources4.She folded the letter so that it would _ her bag.A)fit forB)fit in withC)fit toD)fit into5.I daren't Bill ___ in the garden: he'd pull up all the flowers.A)let … looseB)let … inC)let … outD)let … alone