A.結(jié)構(gòu)件 B.一般構(gòu)件 C.重要構(gòu)件 D.零部件
A.1/1000~1.3/1000 B.0.9/1000~1.3/1000 C.1/1000~1.4/1000 D.0.9/1000~1.4/1000
A.1/300 B.1/350 C.1/400 D.1/500