A.2 B.5 C.7 D.9
A.3.5 B.4 C.5 D.6
A.角钢支架 B.电杆 C.木杆 D.膨胀螺栓
A.8 B.10 C.12 D.5
A.0.15 B.0.2 C.0.25 D.0.3