问题
单项选择题
向心球轴承，主要承受（）荷载。
A．轴向
B．径向
C．双向
D．切向
答案
参考答案：B
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向心球轴承，主要承受（）荷载。
A．轴向
B．径向
C．双向
D．切向
参考答案：B
| 完形填空。 | |||
| The Browns are 1 neighbor(邻居). Mr Brown's name is John. But when his neighbors talk 2 him, they all call him"Mr Going-to-do". Do you know 3 ?Mr Brown always says he is going to do something,_ 4 he never does it. Every Saturday Mr Brown 5 to the Smiths' back door and talks to Mr Smith. He always says he is going to do something. 1'm going to clean my house today,"he says, "l'm going to wash my car tomorrow," or, "These trees in front of my house are 6 big. I'm going to cut them down next week. " Mr Smith usually says,"Are you, John?" He knows his neighbor is not going to clean his house, or wash his car, or cut down 7 trees. Then he says,"Well, 8 , John, I’m going to do some work in the house. "And he 9 . Mr and Mrs Smith often say to their only child Dick,"Are you going to do something? Then do it! 10 another 'Mr Going-to-do. | |||
| ( )1. A. Smith ( )2. A.like ( )3. A. how ( )4. A. or ( )5. A. go ( )6. A. two ( )7. A. much ( )8. A. excuse ( )9. A.is ( )10. A. Be not | B. the Smiths B.to B. which B. and B. going B. many B. some B. hello B. do B. Do be not | C. Smiths C. about C. what C. but C. goes C. a lot of C. any C. thank you C. will C. Don't be | D. the Smiths' D. over D. why D. so D. is going D. too D. a little D. sorry D. does D. Be not do |