问题
多项选择题
螺旋滚筒的螺旋方向有（）之分。
A.左旋
B.右旋
C.正旋
D.侧旋
答案
参考答案：A, B
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螺旋滚筒的螺旋方向有（）之分。
A.左旋
B.右旋
C.正旋
D.侧旋
参考答案：A, B
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