氧乙炔焊由于氧与乙炔混合比例不同,可产生三种性质不同的火焰:中性焰,碳化焰,氧化焰,

题型:单项选择题

问题:

氧乙炔焊由于氧与乙炔混合比例不同,可产生三种性质不同的火焰:中性焰,碳化焰,氧化焰,其中的碳化焰适用于焊接()。

A、一般低碳钢,不锈钢,紫铜和铝合金;

B、高碳钢,铸铁;

C、黄铜

考点:电厂电机专业技能考试电厂电机高级工电厂电机高级工题库
题型:单项选择题

阅读理解。

     Now there are many thousands of computers all around the world. Some of them are big and some of them are

small.  They are very useful . People can use them to send and get e-mails,   look for   things on the Internet, play

computer games ... But in 1946 the first computer in the world cannot do these things. It is for calculating. It is as

big as a room! Only some scientists can use it. Some people say the first computer is in China. Why do they think

so? Because the first abacus(the oldest calculating machine) appeared much earlier in China than the big computer

in America.      

Notes: calculate 计算 scientist 科学家 abacus 算盘 appear 出现

回答下列问题:

1.What can people use the computer to do ?

_______________________________________________________.

2.Can the first computer do these thing in 1946?

___________________________________________________.

3.What is the first computer used for?

____________________________________________________________.

4.Why do some people think the first computer is in China?

__________________________________________

5.What do you think of it? Do you think the first  computer is in China ,too?

____________________________.

题型:单项选择题

下面列出的条目中,哪些是事务并发执行中可能出现的主要问题Ⅰ.丢失更新   Ⅱ.对未提交更新的依赖   Ⅲ.不一致的分析

A.Ⅰ和Ⅱ

B.Ⅱ和Ⅲ

C.Ⅰ和Ⅲ

D.都是

题型:单项选择题

Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.

A.grow

B.stay

C.appear

D.become

题型:单项选择题

如果社会经济增长总体速度放慢,则对企业来说()。

A.与企业无关

B.企业成长机会减少

C.更要保持企业的增长速度

D.应进行多元化投资

题型:单项选择题

背景

某施工总承包单位承担一项建筑基坑工程的施工,基坑开挖深度12m,基坑南侧距基坑边6m处有一栋6层既有住宅楼。基坑土质状况从地面向下依次为:

(1)杂填土0~2m;

(2)粉质土2~5m;

(3)砂质土5~10m;

(4)黏土10~12m。

上层滞水水位在地表以下5m(渗透系数为0.5m/d),地表下18m以内无承压水。基坑支护设计采用灌注桩加锚杆。施工前,建设单位为节约投资,指示更改设计,除南侧外其余三面均采用土钉墙支护,1:0.1放坡开挖。基坑在开挖过程中,北侧支护出现变形,但一直没有引起注意,最终导致北侧支护部分坍塌。事故调查中发现:

(1)基坑工程为专业分包,施工总承包单位督促专业分包单位针对深基坑组织编制了专项施工方案,并指示基坑分包单位组织了专家论证,定稿后由总承包单位项目总工、总监理工程师签批后组织实施;

(2)施工总承包单位及基坑分包单位均未有健全的安全管理制度文件;

(3)开挖过程中,由于现场场地狭小,同时在基坑顶堆放材料及设置加工场;

(4)施工过程中,无有效降水措施,仅采用坑底明排,且时断时续;

(5)施工过程中总承包单位对深基坑作业相关人员仅有安全检查记录,无交底记录及培训教育纪录等其他记录资料。总承包单位认为均应由专业分包单位完成。

总承包项目经理部是否应对深基坑作业人员进行安全技术交底?如需要,应由谁进行交底?是否需要保存安全技术交底记录?

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