当裂解气压缩机驱动蒸汽压力突然升高时,压缩机的()。A、转速变低 B、一段吸入罐压力

题型:单项选择题

问题:

当裂解气压缩机驱动蒸汽压力突然升高时,压缩机的()。

A、转速变低

B、一段吸入罐压力变低

C、吸入气量变低

D、透平出力变小

考点:乙烯装置操作工乙烯压缩理论知识乙烯压缩理论知识题库
题型:单项选择题

(3分)下图是表示物质分子的示意图,图中“●”和“○”分别表示两种不同的原子,则图中

(1)表示单质的是_________ (2)属于化合物的有_________ (3)属于混合物是_________

A、           B、               C、                   D、

题型:单项选择题

变异系数CV的数值()。

A.一定大于1

B.一定小于1

C.可大于1,也可小于1

D.一定比标准差小

E.一定比均数小

题型:单项选择题

能形成假菌丝的孢子是()

A.关节孢子

B.芽生孢子

C.分生孢子

D.厚膜孢子

E.孢子囊孢子

题型:单项选择题

阅读下面短文,然后按照要求写一篇150词左右的英语短文。

Lots of teenagers are trying to enter a university by coping stories and phrases from the internet to fill out their personal statements in Britain. Personal statements are used to show what can make applicants (申请)different as they outline their interests and reasons for studying a particular course. But it seems that some ideas and words are alike, even the same, thanks to an internet site designed to help those who don’t know what to write about themselves. A study found that nearly 800 applications had personal statements containing phrases taken from three online examples. The study, which involved examining 50,000 personal statements, found that 5% used the material from the internet, most from one free website. Borrowed material was most likely to appear at the end of a statement or where the applicant described the reasons for wanting to study a subject. Almost all applications are now completed online, but the new evidence of Internet temptation(诱惑)follow concern that teenagers are cutting and pasting material for A-level coursework(课程作业). A spokesman said later that he and his partners were looking for ways examine whether people appeared to be copying material.

[写作内容]

  1.以约30个词概括短文的要点;

  2.以约120个词表达你对校园中出现作弊现象的看法,并包括如下要点:

  (1)分析某些学生作弊的原因;

(2)指出作弊引起的不良后果;

(3)号召学生们杜绝作弊现象的发生。

[写作要求]

1.          在作文中可以使用实例或其他论述方法支持你的论点,也可以参照阅读材料的内容,但不得直接引用阅读材料中的句子。

2.          作文中不能出现真实姓名和学校的名称。

[评分标准]

  概括准确,语言规范,内容合适,篇章连贯。

(请考生在答题卷上作答。)

题型:单项选择题

下列行为中,一般不能引起债的法律关系产生的是()。

A.某建设单位向若干施工企业发出招标公告

B.某企业在银行取款时,由于工作人员疏忽,多支付其2万元

C.某施工企业塔式起重机倒塌将附近一超市砸毁

D.建设单位将施工企业遗留的施工设备代为保管

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