單項(xiàng)選擇題已知一車床上導(dǎo)螺桿之螺距為6mm,若欲車制M12×1.5之雙線螺紋,則當(dāng)工件轉(zhuǎn)一圈時,導(dǎo)螺桿應(yīng)轉(zhuǎn)幾度()

A.720°
B.36°
C.180°
D.90°
E.以上皆非


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