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【多选题】
关于图中的画法,说法正确的是:
A.
图中所用的剖切面是平行剖切面
B.
图中的剖切面的转折处不能画投影
C.
图中剖切面的转折处应错开机件内卫结构轮廓,不出现不完整要素
D.
采用阶梯剖表达零件时,必须在剖切面的起止出做标注
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