单项选择题
A.180tB.184tC.186tD.187t
A.250kPaB.300kPaC.350MPaD.400kPa
A.25MPaB.28MPaC.30MPaD.35MPa
A.80kNB.100kNC.120kND.150kN
微信扫一扫,加关注免费搜题