A.D≤60mm，△f≤0.5mm B.D≤60mm，△f≤1.0mm C.D≤60mm，△f≤1.2mm D.D≤60mm，△f≤1.4mm
A.二级 B.三级 C.四级 D.五级
A.3 B.5 C.10 D.8
A.1 B.2 C.3 D.2个或3个
A.HB B.HRA、HRB、HRC C.HV D.LM
