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问题 填空题

在棒磨机中棒与矿石成（）接触。

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参考答案：线

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                              New Library Rules
1. From Monday to Friday: open time:8 :30-4:30.
2. No talking,
3. No eating any food.
4. No listening to music.
5. No taking photos.
6. No taking books out if' you don't ask the people here.
7. Keep the library books for only one week.
8. Give the books back on time.
9. Renew (续借) books on time.
10. Pay for the lost books.
1. When can we read books in the library?
A. On weekends.                      
B. At 2:00 p. m.  on Monday.
C. For eight hours,                      
D. At five on Tuesday.
2. What can we do in the library?
A. Eating food.
B. Taking photos.
C. Borrow books.
D. Take books out before we ask the people in the library.
3. If we lose the library books, we have to            .
A. buy them                          
B. pay for them
C. renew them                        
D. ask the people there
4. Which of the following can't we do in the library?
A. Give the books back on time.          
B. Renew the books on time.
C. Talk loudly.                        
D. Be quiet.
5. What time do we have to leave the library?
A. At 2:00 p. m.                          
B. Before 4:30 p. m.
C. After 4:30 p. m.                        
D. In the afternoon.
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单项选择题

SQL 语句中查询条件短语的关键字是 ______。

A．WHERE

B．FOR

C．WHILE

D．CONDITION
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