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【单选题】
下面选项不正确的是（）A.
槽铣刀主要加工直槽，不能加工台阶面
B.
成型铣刀是加工外成型表面的专用铣刀
C.
键槽铣刀只有两个刃瓣，兼有钻头和立铣刀的功能
D.
圆柱铣刀用于在卧式铣床上加工面积不太大的平面
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