试题与答案

调节系统的静特性曲线在空负荷和满负荷附近都要陡一些。

题型:判断题

题目:

调节系统的静特性曲线在空负荷和满负荷附近都要陡一些。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, C, E

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小题2:My classmate c_________ me to a running race and everybody wanted to see who could run faster.

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小题4:You should c_________ in English with your friends whenever you can.

小题5:A good m_________ for remembering the spelling of a word is to make a short sentence with each letter of the word.

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题型:单项选择题

有一无吊车工业厂房,采用刚性屋盖,其铰接排架结构计算简图如图2-22所示。结构安全等级为二级;在垂直排架方向设有柱问支撑。混凝土强度等级为C20,纵向钢筋采用HRB335级钢,箍筋为HPB235级钢。柱子截面尺寸400mm×500mm,计算时假定as=a’s=40mm。柱顶竖向静荷载标准值P=400kN,并假定屋面活荷载为零。风荷载标准值q1=4kN/m,q2=3kN/m。

提示:

①柱顶荷载作用在柱子中心线上;

②在风荷载作用下柱顶刚性横梁的轴向压力为1.5kN(标准值);

③在排架内力计算时不考虑柱自重;

④在排架方向,柱按偏心受压构件计算其正截面强度,且为对称配筋;

⑤在垂直排架方向,柱按中心受压构件计算其正截面强度。

在竖向荷载与风荷载共同作用下,排架左列柱柱底截面的最大轴向力设计值Nmax及其相应的M和V的设计值最接近于()。

A.A

B.B

C.C

D.D

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