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标题: GWD31 2-6 [打印本页]

作者: ilffforever 时间: 2006-10-29 17:34
标题: GWD31 2-6

不会贴图片只好自己画

                                 AAAAA

A A

I--- 12feet ---I

The figure above shows the dimensions of a semicircular cross section of a one-way tunnel. The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel. If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A. 5½ ft

B. 7½ ft

C. 8 ½ ft

D. 9½ ft

E. 10 ft

answer:b

看不懂这道题的题意,哪位好心人能指点迷津?

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