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问题 选择题

同一平面内几组共点力中，它们的合力一定不为零的是[ ]

A、5N、9N、12N

B、10N、14N、20N

C、9N、12N、20N

D、5N、12N、20N

答案

答案：D

单项选择题

ArcMap中的（）工具条可以实现影像、图片的校准。

A.Editor

B.ArcScan

C.Georeferncing

D.DataFrameTools
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单项选择题

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A．toomany

B．redundant

C．long

D．trivial
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