A.2 B.4 C.4.2 D.10
A.145m B.150m C.160m D.180m
A、垂直静载荷 B、动载荷 C、侧向载荷 D、冲击载荷
A.180t B.230t C.250t D.260t
A.8 B.12 C.15 D.20
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