A.0~0.4mm B.1~0.4mm C.2~0.5mm D.3~0.4mm
A.平均值≤0.4mm. B.平均值≤0.3mm C.平均值≤0.25mm D.平均值≤0.2mm
A.平均值≤0.2mm B.平均值≤0.3mm C.平均值≤0.15mm D.平均值≤0.5mm