问题
填空题
轴承发热及损坏的主要原因是轴承内润滑油不够或脏污、油内有灰砂杂质等碎屑，造成轴承（）和（）等。
答案
参考答案：磨损严重；剧烈振动
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轴承发热及损坏的主要原因是轴承内润滑油不够或脏污、油内有灰砂杂质等碎屑，造成轴承（）和（）等。
参考答案：磨损严重；剧烈振动
| 连词组句。 |
| 1. very much, likes, Danny, my, friend, donuts →__________________________________________ 2. shorts, her, clothes, are, favourite →__________________________________________ 3. school, at, lunch, have, Tom and his classmates →__________________________________________ 4. go, do, to, how, school, you →__________________________________________ 5. does, when, your, brother, up, get →__________________________________________ |