试题与答案

Jack and Mike were found cheating in the

题型:选择题

题目:

Jack and Mike were found cheating in the exam, and _____ by their teacher at the moment.

[      ]

A. were scolded

B. are being scolded

C. have been scolded

D. were being scolded

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:氯化铜中铜离子发生水解,铜离子减少,A错误;O2 参与化学反应不一定就是做氧化剂被还原-2价,所以标准状况下22.4 L O2转移电子数不都是4NA ,B错误;锌与与足量硝酸反应,锌都是被氧化为+2...

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题型:单项选择题

31~40 某无吊车厂房(如题31~34图无吊车厂房简图所示)长8m×6m=48m,宽15m,采用无檩体系装配式钢筋混凝土屋盖,水平投影面上屋盖恒载为3.55kN/m2(包括屋梁自重),屋面活荷载标准值为0.7kN/m2,基本风压值为0.5kN/m2。屋面梁的反力中心至纵墙轴线的距离为150mm,房屋出檐700mm,屋面梁支座底面标高为5.5m,室外地面标高-0.2m,基础顶面标高为-0.5m,窗高3.4m,墙体用烧结普通砖MU10和M7.5砂浆砌筑,施工质量控制等级为B级。

根据内力组合结果,假定A柱基础顶面内力设计值M=48.9kN·m,N=391.51kN,承载力计算公式NφfA的左、右端正确值最接近下列()项数值

A.N=391.51kN≤φfA=497.60kN

B.N=391.51kN≤φfA=412.97kN

C.N=391.51kN≤φfA=396.40kN

D.N=391.51kN≤φfA=556.27kN

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