A.1m B.1.5m C.2m D.2.5m
A.120 B.140 C.160 D.180
A.70% B.75% C.80% D.85%
A.12m簡(jiǎn)支箱梁 B.22m簡(jiǎn)支箱梁 C.32m簡(jiǎn)支箱梁 D.42m簡(jiǎn)支箱梁
A.2個(gè) B.3個(gè) C.4個(gè) D.5個(gè)
A.12:00 B.14:00 C.16:00 D.18:00