【单选题】
弧垂观测时，连续档在【】档以上，靠近两端及中间各选一档作为观测档。___
A. 3
B. 5
C. 7
D. 9
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答案
B
解析
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choose five___
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D.
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【单选题】
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【单选题】
Refer to the exhibit. what is the e ffect of the given configuration？___
A. It enables authentication，
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C. The two routers receive normal updates from one another.
D. The two device s are able to pass the message digest to one another.
