汽缸螺栓造成偏斜的原因有哪些？

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问题问答题

汽缸螺栓造成偏斜的原因有哪些？

答案

参考答案：

原因有：

（1）汽缸螺栓的底螺纹中心线与汽缸法兰平面不垂直

（2）汽缸螺栓的大螺母内螺纹中心与螺母端面不垂童

（3）垫圈厚度有较大的偏差

听力题

根据中文、英文解释或句意填空

1. My father is a very good ____________(游泳者). He can swim so well.

2. ____________ is the first day of a week and Monday is the second.

3. We don’t like Daniel because he is not very ____________(礼貌) and likes playing tricks on others.

4. I’m a little fat, and I think I need more ______________ (锻炼)

5. The book is so ______________ (fun), and we all want to read it.

填空题

乐器葫芦丝属于（）乐器。