装配图中的装配尺寸是表示机器或部件之间的装配关系和相互位置的尺寸。
参考答案:对
阅读理解。
My name is Zhang Lin. Today is my birthday. I'm nine years old. Mum and Dad get a big cake for me. I
like it very much. It's on the table now. There are some other things on the table, too, such as apples, oranges,
juice, chicken and some fish. I'm thirsty (渴) now. I'd like a bottle of orange juice. My friends Li Fan and Bing
Jie come today.
1. Zhang Lin is .[ ]
A. twelve
B. ten
C. nine
2. There are some on the table.[ ]
A. eggs
B. apples
C. pens
3. Lin Fan and Bing Jie are Zhang Lin's .[ ]
A. sisters
B. brothers
C. friends
4. Zhang Lin is now.[ ]
A. hungry
B. thirsty
C. full
5. Who comes today?[ ]
A. Zhang Lin's parents.
B. Zhang Lin's sisters.
C. Zhang Lin's friends.
当开动某机构运行时,起重机就掉闸的可能原因有()。
A、电压偏低
B、速度过快
C、电流继电器整定值偏小