单项选择题
A.≤1mm，≤1.5mm B.≤0.5mm，≤1.5mm C.≤0.5mm，≤1mm D.≤1mm，2mm
A.±1mm B.±2mm C.±3mm D.±4mm
A.脏污，气泡 B.斑纹，手指印 C.褶皱、脏污 D.脱层