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when several parallel cutting planes are used to cut， there will be a bold line at the corner of turning point.
when several parallel cutting planes are used to cut， there will be a bold line at the corner of turning point.
A.正确
B.错误
正确答案：错误
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An object be represented as local section in the condition that both the outside and inside are complex， and its structure is not symmetry。
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Superposition cut is represented as thick line and is put inside the original view。