与X线摄影比较,哪一项不是CT的优势() A.密度分辨力高 B.空间分辨力高 C.适 发布时间:2017-04-30 09:00 │ 来源:www.tikuol.com 题型:单项选择题 A1/A2型题 问题: 与X线摄影比较,哪一项不是CT的优势()A.密度分辨力高B.空间分辨力高C.适合进行软组织病变的观察D.适合进行腹部实质性脏器的观察E.适合观察脑实质的病变
题型:单项选择题 A1/A2型题 某格构式单向压弯柱,采用Q235钢,柱高6m,两端铰接,在柱高中点沿虚轴x方向有一侧向支撑,截面无削弱。柱顶静力荷载设计值:轴心压力N=600kN,弯矩Mx=±150kN·m,柱底无弯矩,如图所示。柱肢选用[25b,A1=3991mm2,Iy=3.619×107mm4,iy=95.2mm,I1=1.96×106mm4,i1=22.2mm,y0=19.9mm。斜缀条选用单角钢,Ad=349mm2,imin=8.9mm。整个格构式柱截面特性:A=2A1=2×3991,Ix=2.628×108mm4,ix=181.4mm。若取φx=0.900,,该压弯柱在弯矩作用平面内的稳定性验算时,其构件上的最大压应力(N/mm2),与下列何项数值最为接近()。A.162B.172C.178D.156 查看答案
题型:单项选择题 A1/A2型题 There were many people present and he appeared only for a few seconds, so I only caught a ()of him.A.glanceB.glimpseC.lookD.sight 查看答案