( )只适用于对定心精度要求不高、载荷平稳和低速的连接。
A.切向键
B.半圆键
C.楔向键
D.花键
参考答案:D
( )只适用于对定心精度要求不高、载荷平稳和低速的连接。
A.切向键
B.半圆键
C.楔向键
D.花键
参考答案:D
阅读理解。
Here are some short messages. Emma got all of them on her mobile phone yesterday.
Please read them carefully and find the best answers to the questions.
Hey,Emma, l'm going to have a party this weekend.
Would you come and join us? (From Susan: 13823636790)
Emma,"Home Alone V"is now on show at People's.
Would you come and See this film? (Vicky: 13096752112)
Emma, Mr Lee said your computer is OK now.
You can goand get it from 10:00 am to6:00 pm.(James: 13654243555)
Emma,Buy some fruits on your way home. Thanks. (From jessie: 13372320909)
1. What did Emma get yesterday?
A. Some letters.
B. Some books.
C. Some messages.
D. Some e-mails.
2. What did Mr Lee do for Emma?
A. He fixed up her computer.
B. He bought her a film ticket.
C. He helped her buy some fruits.
D. He helped her answer the phone call.
3. What is "Home ALone V"?
A. A book.
B. A game.
C. A song.
D. A film.
4. Who asked Emma to call back?
A. Susan.
B. Jessie.
C. Vicky.
D. James.
5. If Emma wants to go to the party this weekend, what number should she send a message to?
A. 13096752112
B. 13654243555
C. 13372320909
D. 13823636790