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【判断题】
外螺纹的牙顶(大径)及螺纹终止线用粗实线表示,牙底用细实线表示。并画到的倒角或倒圆部分。当需要表达螺纹收尾时,螺尾部分的牙底用与轴线成 30度的细实线绘制。在垂直与螺纹轴线方向的视图中,表示牙底(小径)的细实线只画约1/2圈,此时不画端面的倒角圆。A.
正确
B.
错误
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举一反三
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A.
very enthusiastic
B.
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C.
afraid of making mistakes
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B.
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A.
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B.
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C.
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D.
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E.
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