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单选题
A hole of several inches in diameter may be cut in a piece of metal at a point where the metal is not needed for strength, and the edges of the hole are flanged to give it rigidity.
A
在一块不需要承力的金属上，可以在某一点处切割一个直径为几英寸的孔，孔的周围用法兰连接，使其具有刚度。
B
在一块金属上，可以在不需要承力的某一点处切割一个直径为数英寸的孔，孔的边缘折边可以使其具有刚性。
C
在一块不需要承力的金属上，可以在一处切割几个直径为数英寸的孔，孔的边缘用凸缘连接，使其产生刚性。
答案解析
正确答案：B
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