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问题 选择题

能在水溶液中共同存在的一组物质是（　　）

A．NaCl、HNO3、CuSO4

B．HCl、NaOH、Na2SO4

C．FeSO4、H2SO4、Na2CO3

D．AgNO3、Ca（OH）2、KCl

答案

答案：A

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     Swimmer wanted
     Can you swim? Do you like kids? Can you help them to swim on weekends? Come and join us. Call  Jane at
330-9785 for more information.

     Musicians wanted
     Boys and girls, are you music lovers? Can you sing or dance? Can you play the instruments (乐器)? Welcome
to our Star Rock Band. Please call Victor at 891-3453 or send an email to music@ yahoo. com.

     Chess Club
     Do you like to play chess? Do you want to play chess well? Mr. Wang can teach you. You can come   here
every Friday afternoon from 13:00 to 16:00. Tel: 623-1904 Room: 102
1. You want to help the kids with swimming, you can call at .
A. 330-9785
B. 891-3453
C. 623-1904
D. Room 102
2. You can play the guitar very well, and you can join .
A. swimming club
B. chess club
C. Star Rock Band
D. Room 102
3. You want to play chess, you can go to Room 102 at every Friday afternoon.
A. 8 a.m.
B. 6 p.m.
C. 5 p.m.
D. 2:30 p.m.
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单项选择题

区内AB相间故障，母线保护动作出口应实现（）跳闸。

A、A相

B、B相

C、AB相

D、三相
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