题目：
按导轨承导面的截面形状，滑动导轨可分为圆柱面导轨和棱柱面导轨，其中（）导轨不易积存切屑、赃物，但也不易保存润滑剂。
A.凹形
B.凸形
C.两者都不是
答案：
参考答案：B
按导轨承导面的截面形状，滑动导轨可分为圆柱面导轨和棱柱面导轨，其中（）导轨不易积存切
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