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【单选题】
两轴线相交成90°角,一个直径为φ20 mm,另一个直径为φ30 mm,以下 是不正确的工艺。A.
用万能角度尺和心轴检测两轴线角度是否合格
B.
用宽座角尺、心轴和塞尺检测两轴线角度是否合格
C.
用百分表和心轴检测两轴线角度是否合格
D.
用千分尺和心轴检测两轴线角度是否合格
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A.
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B.
To explain the differences between two frames of reference.
C.
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D.
To argue that frames of reference exist.
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D.
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