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In circular view， the notch of screw head should be drawn with an inclind angle of（）
In circular view， the notch of screw head should be drawn with an inclind angle of（）
A.60°
B.120°
C.90°
D.45°
正确答案：45°
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When draw internal thread， major diameter is drawn as thin line ， minor one is drawn as thick line in non circular view.
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What is the unit in Ra6.3？