单项选择题
A.10B.20C.30D.40
A.50mm~80mm;60B.60mm~80mm;80C.50mm~90mm;60D.60mm~90mm;80
A.1B.2C.3D.4
A.2;10B.3;20C.4;30D.5;40
A.0.1B.0.2C.0.3D.0.4