当装置紧急停车,加入CO阻聚剂后,可以通过()等操作来降低环管反应器中的CO浓度。A

题型:多项选择题

问题:

当装置紧急停车,加入CO阻聚剂后,可以通过()等操作来降低环管反应器中的CO浓度。

A、通过向反应器注入新鲜丙烯,从丙烯冷凝器的尾气排放置换

B、向环管反应器加入三乙基铝

C、通过将丙烯洗涤塔的丙烯直接送至气提塔,进行脱除CO

D、向环管反应器加入给电子体

考点:聚丙烯装置操作工聚丙烯装置操作工题库
题型:多项选择题

下列不属于关于动机因素的是( )。

A.决定人行为的方向

B.人的意志程度

C.坚持的水平

D.努力的水平

题型:多项选择题

建设单位应当在工程竣工验收( )个工作日前将验收的时间、地点以及验收组名单书面通知监督站。

A.1

B.2

C.7

D.14

题型:多项选择题

What is distance learning It means that you study on your own, at home or wherever suits you. Recently, the world famous Open University in the United Kingdom has designed a new style of distance learning, which is called (1) . The phrase "Open Learning" means you study (2) . You read course material, work on course activities, and write (3) . The word "Supported" means you have help (4) , the student services staff at regional centres, and centralized areas such as (5) . You can also contact other students through tutorials and (6) , the University’s online conferencing system, and events and clubs organized by (7) . Most distance learning courses use printed paper materials. They also include some (8) materials such as a CD, DVD or video. Many courses have a web site and an (9) . You’ll need access to a computer (10) to make use of these. The Open University can help its students buy a computer and (11) the cost of accessing the Internet.

With most distance learning courses, no (12) are required to study. of course, you have to be aged 18 when your course starts but there is no (13) . Currently the Open University has around (14) undergraduate and more than 30,000 postgraduate students, of which 10,000 have (15) . Nearly all students are studying (16) . About 70 per cent of undergraduate students are in (17) . More than 50,000 students (18) by their employers for their studies. Most distance learning courses (19) . Some of them are even available in other parts of the world. With over 25,000 of its students living outside the UK, the Open University is the (20) that offers distance learning throughout the world.

1()

题型:多项选择题

《图经本草》成书于()

A.汉代

B.唐代

C.宋代

D.明代

E.清代

题型:多项选择题

下列项目中,既可以采用费率方式又可以采用人工计价的是()。

A.软件服务

B.软件开发

C.商用套装软件实施

D.以上答案均不对

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