问题
判断题
链传动是一种啮合传动，所以它的瞬时传动比恒定。( )
答案
参考答案：错
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链传动是一种啮合传动，所以它的瞬时传动比恒定。( )
参考答案：错
| 阅读理解。 |
| Here is a new picture. In the picture there are four boys and three girls in a room. They are all students. The boy at the desk is Jim. The girl near the window is Kate. Jim's sister Jane is on the chair. Ann is behind Mike. Mike is at the door. Mike's brother Sam is under the table. Where is Tom? Oh, he is over there, behind the door! They are all very happy. |
| 1. How many students are there in the picture? |
[ ] |
| A. Seven B. Four C. Three D. Five |
| 2. What are the girls' names? |
[ ] |
| A. Jim, Kate and Jane. B. Kate, Ann and Mike. C. Mike, Sam and Tom. D. Kate, Jane and Ann. |
| 3. Where are Ann and Mike? |
[ ] |
| A. On the chair. B. Near the window. C. Under the table. D. At the door. |
| 4. Who is Jane's brother? |
[ ] |
| A. Tom B. Jim C. Mike D. Sam |
| 5. Who is behind the door? |
[ ] |
| A. Mike B. Jim C. Sam D. Tom |