问题 选择题

硫有多种形式的单质,其中一种分子为S6,则下列说法中正确的是()

A.此物质与单质硫为同素异形体

B.1mol这种硫单质与阿伏伽德罗常数个水分子所含的原子数相等

C.这种分子的摩尔质量为192 g

D.在标准状况下,1mol这种硫单质的体积为22.4 L

答案

答案:A

题目分析:由同一种元素形成的不同单质,互为同素异形体,所以选项A正确;B不正确,1mol该单质含有6molS原子,而1mol水含有3mol氢原子;摩尔质量的单位是g/mol,C不正确;D不正确,因为该物质在标准状况下不是气态,答案选A。

点评:在使用气体摩尔体积时必需注意该物质是否为气态,特别是22.L/mol只有在标准状况下的气态才能适用。

阅读理解

Once upon a time,two brothers who lived on neighboring farms fell into conflict(冲突).It was the first serious one between them in 40 years of farming peacefully side by side. In the end,they fell apart.

One morning,a man with a carpenter's toolbox came for some work. The elder brother said,“I just have a job for you. Look at that farm across the creek(河沟).My younger brother lives there. It was he who used his bulldozer(推土机)to dig the creek last week to spite(刁难)me. So I want you to build me a fence,an 8­foot­high fence,in order not to see his place any more.”The carpenter smiled and said,“I see. I'll try to do a job that satisfies you.”Then the elder brother went downtown.

At sunset when the farmer returned,the carpenter had just finished his job. The farmer's eyes opened wide! To his surprise,there was no fence there at all!Instead, there was a bridge stretching from one side of the creek to the other! A fine piece of work! He saw his younger brother coming to him with the hands outstretching. The brothers stood at each end of the bridge,and then they met in the middle,taking each other's hands. They turned to see the carpenter lift his toolbox on his shoulder. “No,wait! Stay a few days. I've a lot of other work for you,” said the elder brother.“I'd love to stay on,”the carpenter said,“but I have so many more bridges to build.”

小题1:What was the life like for the two brothers before the conflict?

A.They lived a poor life.

B.They lived in peace.

C.They never spoke to each other.

D.They lived on the same farm.小题2:It can be learned that the carpenter was __________.

A.unwilling to obey the farmer.

B.fond of building bridges.

C.unable to build a fence

D.willing to help others.小题3:Which of the following is TRUE according to the passage?

A.The elder brother used his bulldozer to dig a creek.

B.The elder brother helped the carpenter build the bridge.

C.The brothers were both satisfied with the carpenter's work.

D.The carpenter planned to build an 8­foot­high fence as asked to.小题4:The best title for this passage is ________.

A.A Fine Piece of Work

B.A Carpenter

C.A Conflict Between Two Brothers

D.Two Brothers

问答题

某钢厂炼钢技改项目内容包括钢结构、工艺设备、工业管道、电气安装等,节能减排,新增氧气制取、煤气回收和余热发电配套设施,炼钢车间起重机梁轨标高27.8m,为多跨单层全钢结构(塔楼部分多层),炼钢工艺采用项底复合吹炼转炉吹氧由球罐氧气干管(D426*9,P=2.4MPa)经加料跨层面输送至氧枪阀门室。 该项目由具有承包资质的A公司施工总承包,在分包单位通过资格预审后,业主同意,A公司将氧气站、煤气站和余热发电站机电安装工程分包给具有相应专业资格和技术资格的安装单位。 A公司项目部进场后,根据图纸、合同、施工组织设计大纲、装备技术水平集现场施工条件进行施工组织总设计编制,塔楼钢结构和工艺设备采用3000t.m主吊方案经批准通过,项目实施过程中,项目部在安全和质量管理方面采取措施下: 措施1:针对工程特点,塔楼施工现场存在危险源较多,项目部仅对临时用电触电危险、构件加工机械伤害危险、交叉作业物体打击危险以及压力试验、冲运转等危险源进行辨识和评价,经公司审定,补充完善后,制定了相应安全应急预案,健全现场安全管理体系。 措施2:针对氧气管道管口错边量超标,内壁存在油脂、诱蚀、铁锈等起燃料爆炸事故,项目部编制施工方案时,制订了包括材料检验、管理试验工序为内容的施工工艺流程,经批准后严格执行。 措施3:氧气站球罐的球壳板和零部件进场后,A公司项目部及时组织检确保分包单位按计划现场组焊。

措施2中,氧气管道施工还应包括哪几道关键工序?