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GWD2-6

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发表于 2006-3-7 13:21:00 | 显示全部楼层

GWD2-6

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



Z这题是怎么回事呢??我怎么算出来是D  答案是C  大家帮帮啊



[此贴子已经被作者于2006-3-7 13:21:25编辑过]
发表于 2006-3-7 13:43:00 | 显示全部楼层
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