— When were you born?
— ______ April 4th, 1994. [ ]
A. at
B. by
C. in
D. on
答案:D
钢材数量验收,当现场检测确有困难时,可到供料单位(),保证进场材料数量准确。
A.点件计数
B.监磅发料
C.检尺换算
D.按车辆吨位计量
某梯形钢屋架跨度21m,端开间柱距5.4m,其余柱距6m。屋架下弦横向支撑承受山墙墙架柱传来的风荷载,下弦横向支撑的结构布置如图所示,钢材为Q235钢。节点风荷载设计值已求出:W1=17.83kN,W2=31.21kN,W3=26.75kN。
支撑桁架的斜杆aB采用单角钢截面,最适合的截面形式为下列何项()
A.45×4,A=3.49cm2,imin=0.89cm,iy=1.38cm
B.50×3,A=2.27cm2,imin=1.0cm,iy=1.55cm
C.63×5,A=6.143cm2,imin=1.25cm,iy=1.94cm
D.70×5,A=6.87cm2,imin=1.39cm,iy=2.16cm