单项选择题
A.50mm B.80mm C.100mm D.120mm
A.60% B.70% C.80% D.90%
A.Ⅰ级钢筋 B.Ⅱ级钢筋 C.Ⅲ级钢筋 D.Ⅱ、Ⅲ级钢筋
A.3～6 B.4～8 C.6～10 D.8～12
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