单项选择题
A.12m简支箱梁 B.22m简支箱梁 C.32m简支箱梁 D.42m简支箱梁
A.70% B.75% C.80% D.85%
A.2 B.3 C.4 D.5
A.2 B.2.5 C.3 D.3.5
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