【基础级练习题139】
<p>1. a 之直径值为何?<br/> (A) 21.4063 (B) 21.4360 (C) 21.4603<br/>2. b 之直径值为何?<br/> (A) 29.2082 (B) 29.2208 (C) 29.2820<br/>3. 剖面线区域之面积为何?<br/> (A) 1422.4267 (B) 1422.4627 (C) 1422.4762</p><p> </p> 1 (B) 2 (C) 3(B) bc b 呵呵,好复杂啊。。 做了一下 <div><img src="file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Tencent/Users/604213406/QQ/WinTemp/RichOle/N)5D}]4`NZ~IPYPWZN1`{%U.jpg"/> </div> 大圆是怎么确定的啊
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