混凝土抗折强度标准试件为150mm³150mm³400mm。

题型:判断题

问题:

混凝土抗折强度标准试件为150mm³150mm³400mm。

考点:公路工程试验检测员水泥、水泥混凝土类水泥、水泥混凝土类题库
题型:判断题

男孩,3岁。生后5个月见体格发育落后,表情呆滞,伴有点头、弯腰样发作,每日约10余次。2岁开始出现呕吐,喂养困难。现体检见小儿智力明显落后,毛发棕黄色,肤色浅,尿无明显霉臭味,尿三氯化铁试验出现绿色。脑电图示高峰节律紊乱。

上述患儿如为非经典型苯丙酮尿症,其发生的最主要机制是()

A.二氢生物喋呤还原酶先天缺乏

B.高苯丙氨酸血症

C.酪氨羟化酶被抑制制

D.血酪氨酸浓度下降

E.四氢生物喋呤生成不足

题型:判断题

为置换、修理或矫正因设计错误、铸造或原材料缺陷而造成的被保险机器本身的缺点错误所支付的费用,应由()承担。

A.生产厂家 

B.安装工程保险 

C.生产厂家和安装工程保险 

D.第三者责任保险

题型:判断题

This was one of my experiences (1) . When I was in my 30s, I was working for a large international company which had its head office in London. I was working in the (2) department.

The company had a training centre which was just outside London. Different courses were held there throughout (3) and I (4) go on one training course a year. These usually started (5) a Sunday evening and lasted six days.

Once I was (6) a week’s training course with about forty (7) sales people. I was in the bar on the Friday evening and suddenly a woman who was (8) behind the bar asked mea curious question. "I hope you don’t (9) my asking," she said, "but I’ve been (10) about it all week. Have you got a sister (11) Mary" The woman’s name was June. And she used to do various jobs at the training centre. She worked in the office, she organized all the food and drink for the centre and she worked in the bar at lunchtime and in the evening.

My answer (12) June’s question was "Yes", and June said, "I thought (13) . I met her last September when she was organizing a course here. " At that time, my sister was working for (14) company but in a different part of the country. That was (15) she came to be at the training centre.

(16) surprised me was how June guessed we were brother and sister. Three things made it even more (17) . First, she had met my sister six months before she met me. Second, they have about sixty new people every week at the training centre. So about one thousand five hundred people had (18) the centre in those six months. And (19) , my sister is married, so she doesn’t have the same family name as me.

We’re not (20) , but I guess we must look quite like each other.

12().

A.of

B.about

C.to

D.for

题型:判断题

某宗地土地使用者经2年自行开发完成基础设施配套,而所在区域土地开发期需要3年,如开发费均匀投入,则采用成本逼近法估价时,土地开发费的计息期应为()年。

A.1 

B.1.5 

C.2 

D.3

题型:判断题

某单跨重型车间设有双层吊车的刚接阶形格构式排架柱,钢材用Q235钢,该柱在车间排架平面内和平面外的高度如图(a)所示。车间排架跨度为36m,柱距12m,长度为144m,屋盖采用梯形钢屋架,预应力混凝土大型屋面板。按排架计算,柱的1-1、2-2截面的内力组合如下:

截面1-1(上段柱):N=1018.0kN,M=1439.0kN·m,V=-182.0kN

截面2-2(中段柱):Nmax=6073.0kN,Vmax=316.0kN,M=+3560.0kN·m

各段柱的截面特性如下(焊接工字钢,翼缘为焰切边):

上段柱:A=328.8cm2,Ix=396442cm4,Iy=32010cm4,ix=34.7cm,iy=9.87cm;Wx=9911cm3

中段柱:A=595.48cm2,y0=77.0cm(重心轴),Ix=3420021cm4,ix=75.78cm

下段柱:A=771.32cm2,y0=134cm(重心轴),Ix=12090700cm4,ix=125.2cm

中段柱缀条布置如图中(b)所示,其截面特性如下:

横缀条用单角钢

125×80×8,A=15.99cm2,ix=4.01cm,iy=2.29cm

斜缀条用单角钢

140×90×10,A=22.26cm2,ix=4.47cm,iy=2.56cm,imin=1.96cm。

中段柱进行排架平面内稳定性计算时,平面内计算长度H02=1953cm,取βtm=1.0,N=6073.0kN,M=3560.0kN·m(最不利作用于吊车肢),试问,吊车肢构件上最大压应力(N/mm2),与下列何项数值最为接近?()

提示:

A.212.7

B.203.6

C.190.8

D.186.5

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