单项选择题
A.1/2 B.1/3 C.1/4 D.1/2~1/4
A.中间加杆吊起 B.上部两端点吊起 C.下部两端点吊起 D.底部两端头槽钢下兜吊
A.1.2m B.1.4m C.1.6m D.1.8m
A.1.6m×1.6m B.1.8m×1.8m C.2.0m×2.0m D.2.2m×2.2m
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