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绘制机床夹具装配总图时，先用（ ）点划线（或红色细实线）画出工件的外形轮廓和（ ）表面。主要表面是指（ ）基准面、夹紧表面和被加工表面。被加工表面的加工余量可用（ ）线（或粗线）表示。A.
双
B.
主要
C.
定位
D.
网纹
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