问题
单项选择题
哪一项不是齿轮工作表面的破坏（）
A.齿面磨损
B.齿面点蚀
C.塑料变形
D.齿轮折断
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
哪一项不是齿轮工作表面的破坏（）
A.齿面磨损
B.齿面点蚀
C.塑料变形
D.齿轮折断
参考答案：D
| 阅读理解。 |
| Julia's father Mr. Green has two brothers and three sisters. Julia's mother Mary has two brothers and two sisters. Julia has a brother. His name is Ben. Look! Ben is on the sofa. Julia is on the chair. Ben likes sports. He has soccer balls and volleyballs. Julia doesn't like sports. She likes reading books. |
| 1. Julia's family name is ______. |
[ ] |
| A. Julia B. Ben C. Mary D. Green |
| 2. Julia has ______ uncles and ______ aunts. |
[ ] |
| A. 2, 3 B. 2, 2 C. 4, 5 D. 5, 4 |
| 3. ______ is on the sofa. |
[ ] |
| A. Julia's father B. Julia's mother C. Julia's uncle D. Julia's brother |
| 4. Mr Green has ______ children. |
[ ] |
| A. one B. two C. three D. four |
| 5. Ben and Julia are ______. |
[ ] |
| A. at home B. in the class C. at school D. in the restaurant |