单项选择题
A.绝对坐标 B.相对坐标 C.前省零 D.后省零
A.board drill negative B.board drill positive C.misc drill negative D.misc drill positive
A.25.4 B.39.37 C.1.4 D.100
A.圆形 B.方形 C.八角形 D.Thermal pad
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