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冲压(剪)作业是靠压力机械和磨具对管材、带材等施加外力，使之变形或分离获得所需冲压件的加工方法。冲压(剪)事故可能发生在冲压(剪)机械的各个部位。冲压(剪)作业的主要危险因素有( )。A.
操作者使用弹性夹钳送进工件
B.
关键零件磨损、变形导致机器动作失控
C.
控制开关失灵导致机器错误动作
D.
模具缺陷导致意外状态
E.
刚性离合器一旦接合运行，将完成冲压(剪)的一个循环
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