A.5mm(主层站大于8mm)B.7mm(主层站大于9mm)C.8mm(主层站大于10mm)D.10mm(主层站大于12mm)
A.0.5mmB.1mmC.1.5mmD.2mm
A.≤0.5mmB.≤1.0mmC.≤1.5mmD.≤2.0mm