如图,要拧开一个边长为a=6cm的正六边形螺帽,扳手张开的开口b至少

如图,要拧开一个边长为a=6cm的正六边形螺帽,扳手张开的开口b至少为(     

A     B12mm     

C      D

答案

解析]画出正六边形,如图,通过计算 可知,ON3MN6,选C

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