Continuous thin irregular line to indicate part sectional boundary lines or to terminate a part view, and for short bre

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 Continuous thin irregular line to indicate part sectional boundary lines or to terminate a part view, and for short break line.If two projections of two lines are parallel, then the two lines are parallel in spaceA:错 B:对 答案: 对A:对 B:错 答案: 错

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