钢结构焊缝质量等级中,以下哪一个适用于对对接焊缝的质量要求()A.二级 B.三级 C

题型:单项选择题

问题:

钢结构焊缝质量等级中,以下哪一个适用于对对接焊缝的质量要求()

A.二级

B.三级

C.四级

D.五级

考点:注册建筑师一级注册建筑师建筑结构
题型:单项选择题

阅读理解。

     In the mid 1990's, people started doing business on the Internet. At that time, there were two kinds of

companies. First, there were traditional companies which sold things in stores. Then, there were Internet

companies which didn't have stores; they sold things only over the Net.

     Traditional companies didn't want to lose any business. Quickly, they created their own websites and

began selling things over the Net. These are the so-called "brick and click" companies. Many stores are

made of brick, and you click on your mouse to buy things with your computer. That's where the name

"brick and click" comes from.

     By the late 1990's, e-businesses like Amazon.com, Buy.com, and eToys.com were in trouble. Their

profits were not very high, and there was a lot of competition. Many of these businesses lost a lot of money,

and in 2000, many businesses were out of business. Why are brick and click companies, like Barnes and

Noble, Toys RUs, and Walmart 50 successful? First, many customers know and trust their names. Their

websites, like Walmart.com, are easy to remember. These companies also have a lot of experience. They

know how to run a successful business.

     In the world of e-commerce (电子商务), companies are fighting for every dollar and every customer.

Will brick and click companies win the war? only time will tell.

1. Many traditional companies created their own websites in _____.

A. the early l990's

B. the mid l990's

C. the late l990's

D. 1990's

2. Why were Internet companies in a lot of trouble in the late 1990's?

A. Competition was heavy

B. Their websites were bad

C. They didn't know what to sell

D. Their profits were high

3. People like buying from brick and click companies because _____.

A. their names are hard to remember

B. they have nice websites

C. they are cheap

D. people trust them

4. What does "win the war" in the passage mean?

A. Quit doing business and become a soldier.

B. Lose the most customers.

C. Be the most successful.

D. Win a game. 

5. Which would be a brick and click company?

A. A clothing company with no website.

B. A bookseller with five stores and an Internet site.

C. A video seller with a big website but no stores.

D. A restaurant.

题型:单项选择题

在系统性红斑狼疮发病的病因中不包括以下哪项内容()

A.环境因素

B.饮食因素

C.性激素

D.遗传因素

E.免疫功能紊乱

题型:单项选择题

婴幼儿易患呼吸道及胃肠道感染是因为:【 】

A.免疫细胞

B.补体

C.igg

D.igm

E.sigA

题型:单项选择题

锅炉的构造、容量、参数和运行的经济性等特点通常用特定指标来表达,表明锅炉热经济性的指标是()。

A.受热面发热率 

B.受热面蒸发率 

C.锅炉热效率 

D.锅炉蒸发量

题型:单项选择题

方向继电器采用()接线方式。

A、90°

B、0°

C、180°

D、125°

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