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问题 单项选择题

使用绝缘电阻测量仪时，测量之前和之后要进行放电，一般放电的时间是多少（）

A.5分钟

B.2－3分钟

C.1分钟

答案

参考答案：B

阅读理解
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For sale

Antique door

Solid wood. Includes a coloured glass window near the top of the door.
Excellent condition. $300.
                                                                                Phone 9411-2987

Baby bed
Lovely bed, painted white. $310. Also travel bed and car seat. $500 for all, 
or will separate.                                               
                                                                                      Phone 4097-5701
Exercise bike

Near new. Bought for $1200, selling for $600.                                               
                                                                                   Call 0289-457-076

Furniture
Dining table and chairs, two double beds, leather sofa and loveseat, chest of
drawers, wardrobe, shelf. Come on and make an offer. Must sell this week.
                                                                        13/453 Crown Rd Fairburn

Golf clubs

Set of eleven. Ladies left hand. Also golf bag, balls. $675.
                                                                                      Phone 9765-9975

Computer

Pentium 166, CD-ROM, 32 RAM, 56K modern, sound, speaker, large
monitor, mouse, keyboard. $220.
                                                                                  Phone 9982-6720

Piano

Kowai Grand GS30, black, excellent action and sound, perfect condition,
music books and stool. $1800.                                              
                                                                                   Phone 9938-1044
TV

Bony 53cm with surround, remote control, with instruction book. Excellent
condition. $300.                                               
                                                                                   Phone 2039-6946

1. Which is the cheapest thing for sale?  
A. A baby bed.
B. A TV.
C. A piano.
D. A computer.
2. If you want to buy an exercise bike, you can call _______.  

A. 0289-457-076
B. 2039-6946
C. 9982-6720
D. 9765-9975

3. If you have only $600, you can buy _______.
A. an antique door and a baby bed
B. a computer and a piano
C. a TV and an antique door
D. a piano and furniture
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单项选择题

楼宇自动化系统主要由（）监控系统、能源设备监控系统、消防系统和保安监控系统四部分组成。

A.环境设备

B.办公自动

C.综合布线

D.通信自动
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