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【单选题】
以下关于数控电火花快走丝线切割机床的说法中,错误的是( )。 A 走丝机构使电机丝以一定的速度运动并保持一定的张力 B 数控电火花线切割加工总是采用负极性加工, C 锥度切割装置可以切割有落料角的冲模和某些有锥度(斜度)的内外表面 D 床身通常采用箱式结构
A.
B.
C.
D.
D
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