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问题 单项选择题

J6级经纬仪的检定周期为( )。

A．1年
B．2年
C．3年
D．4年

答案

参考答案：A

解析： 本题考查精密仪器的检定周期，考查《测绘计量管理暂行办法》的内容。J2级以上经纬仪的检定周期为1年。

阅读理解

This is a picture .There is a lake (湖)in the middle of the picture .On the lake we can see a boat .In the boat, there is a boy and his father .The boy is fishing .His father is looking at him .We can see some fish swimming in the lake .On the right of the picture , we can see a big tree .A young woman is reading a book .Her name is Mary .We can see very nice flowers near her seat .A little yellow dog is beside her feet .There are some birds in the sky .On the other side of the lake ,we can see three children .They are laughing and flying kites .They are having fun.

小题1:This is a picture of _____.

A．A park

B．Mary’s family

C．a school

D．a restaurant小题2:Mary is ______.

A．looking at her son

B．reading a book

C．swimming in the lake

D．flying a kite小题3:The little dog is ____.

blue  B. yellow  C. black  D. brown

小题4:There are _____people in the picture .

A．2

B．4

C．6

D．8小题5:Are they having a great time ?

A．No, they haven’t .

B．No, they aren’t .

C．Yes , they have .

D．Yes , they are .
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单项选择题

LFP901A保护在通道为闭锁式时，通道试验中，按下试验按钮，本侧发信，（）ms后本则停信。

A、5s

B、200ms

C、500ms

D、10s
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