下列关于Ig的特性哪项是错误的A.IgA多为双聚体 B.IgG是唯一能通过胎盘的免疫

题型:单项选择题

问题:

下列关于Ig的特性哪项是错误的

A.IgA多为双聚体

B.IgG是唯一能通过胎盘的免疫球蛋白

C.IgM是分子量最大的免疫球蛋白

D.免疫应答过程中产生最早的是IgG

E.正常血清中IgE是含量最少的免疫球蛋白

考点:公卫执业医师公卫执业医师14
题型:单项选择题

由曲线f(x)=x2-1和直线y=0所围成的封闭图形的面积为______.

题型:单项选择题

阅读下列材料,从所给的六个选项(A、B、C、D和E)中,选出符合各人要求的电视连续剧选项,并在答题卡上将该项涂黑。选项中有一项是多余选项。

小题1:"It's shown only early in the mornings, so I enjoy it before I go to work. This program focuses on the issues of one country, in which I am interested. I hope I will visit it in the future. "

小题2:"I like the series because sometimes it's about teenagers' problems, which helps me know more about my students. The series might have episodes that are not suitable for children, so I have to make some change for my lesson. "

小题3:"I can learn more about Greece and about the role of women in a particular society. In my writing for graduation, I benefit a lot from this series. Students of history all enjoy it very much. "

小题4:"I haven't missed one episode because it offers necessary information in educating my kids. But the show is on only once a month. I wonder why not air more…"

A

Good Bodies 25mins. 10eps. First Saturday each month at 9:00 a.m.

It takes a lively approach to helping very young children acquire the knowledge needed to stay well. Good body (played by John Burstein, the series' creator) and a group of children encourage students to adopt behavior that can keep them healthy.

B

Issues For the Millennium 30mins. 25eps. Monday 7:00 p.m.

This series uses the latest knowledge to introduce social problems young people meet with today. It often deals with sensitive topics, please preview the programmes before using them in a classroom.

C

Exploring Wisconsin Our Home 22mins. 54eps. Weekdays 3:30 p.m.

As Wisconsin is the place that people of many races and cultures call home, the programme has several themes of locations, movements and human--environment interactions. All these things make up the geography of the Badger State.

D

Mexico: Its People and Places 15mins. 10eps. Thursday 6:00 a.m.

This series offers basic information of Mexico’s history and cultural heritage of its people. Each program is a short documentary that can stand alone.

E

Ancient Civilizations 30mins. 6eps. Sunday2:00 p.m.

This series traces the development of economy, government and culture among ancient civilizations in China, India, Egypt, Rome and Greece. Using models, the series examines daily life within these countries, paying attention to the role women played in each society.

题型:单项选择题

NH4ClO4(高氯酸铵)可用作火箭推进剂,当它发生分解反应时,不能生成的物质是

A.SO2

B.Cl2

C.O2

D.N2

题型:单项选择题

下列关于压力表更换的说法不正确的是()。

A、更换压力表时应与系统物料切断

B、选压力表应选测量范围在1/3量程以内的压力表

C、压力表应安装在操作人员易于观察的部位

D、应根据被测介质的性质来选择压力表

题型:单项选择题

下列关于反应器循环泵的作用说法正确的是()。

A、反应器循环泵的主要作用是给反应器内的油煤浆提供动力,形成沸腾床,增加反应深度

B、油煤浆在高温、高压、临氢的工况下和催化剂反应,反应生成油一部分通过循环杯进入到下一道工序,另一部分通过的循环杯的降液管进入循环泵的入口

C、调整反应器内温差

D、防止分配盘上煤粉堵塞

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