单项选择题
A.Arc B.Via C.Pad D.String
A.Grid B.Electrical Grid C.Visiable Grid D.Snap Grid
A.Top layer设置为:Horizontal;Bottom layer设置为:Any B.Top layer设置为:Vertical;Bottom layer设置为:Any C.Top layer设置为:Horizontal;Bottom layer设置为:Vertical D.Top layer设置为:Not Used;Bottom layer设置为:Vertical