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2. Dialogue2Jack: Hello! May I speak to Mike?Mike: (1) __________Jack: Mike, what do you think of your new school?Mike: Things are quite different there. I like it very much.Jack: Really? (2) __________Mike: Yes, I go to school every day! And we can join in the club activities every Wednesday afternoon.Jack: That sounds great.(3) __________Mike: Seven.Jack: (4) __________Mike: I like English best. I am interested in listening and speaking.Jack: (5) __________A. What is your favorite subject?B. Good!C. Do you go to school every day?D. Yes, this is Mike speaking.E. How many subjects do your have?

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图片中零部件名称为

A. 油底壳
B. 气缸体
C. 气缸盖
D. 气缸盖罩

四冲程发动机和二冲程发动机的区别是

A. 四冲程发动机完成一个工作循环需要运行四个冲程,二冲程发动机完成一个工作循环需要两个冲程
B. 四冲程发动机的体积更大
C. 四冲程发动机完成一个冲程需要四个循环,二冲程的完成一个冲程需要两个循环
D. 二冲程发动机的工作效率更高

发动机的作用是把燃料燃烧产生的____转化为____,把活塞的____运动转化为曲轴的____运动。

做功行程在活塞到达气缸上止点开始。

A. 对
B. 错

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