单项选择题
A.±30mm B.±50mm C.±100mm D.±150mm
A.±50mm B.±100mm C.±150mm D.±300mm
A.60% B.70/5 C.80% D.90%
A.砌碹 B.钢筋 C.金属网 D.锚杆
微信扫一扫,加关注免费搜题
