单项选择题
A.0.5mm-1mmB.0.5mm-0.75mmC.0.75mm-1mmD.0.25mm-0.75mmE.0.25mm-0.5mm
A.向下,向下B.向上,向下C.向上,向上D.向下,向上
A.1mmB.1.2mmC.1.5mmD.0.5mm