目前常用的风口包括( )。 A．格栅风口 B．条缝型风口 C．地板型回风口 D．圆

已知：R－CH＝CH－O－R′(烃基烯基醚) R－CH₂CHO + R′OH 烃基烯基醚A的相对分子质量

（M r）为176，分子中碳氢原子数目比为3∶4 。与A相关的反应如下

请回答下列问题：

（1）A的分子式为__________；

（2）B的名称是__________；A的结构简式为__________；

（3）写出C→D反应的化学方程式：___________________________；

（4）写出两种同时符合下列条件：

① 属于芳香醛；②苯环上有两种不同环境的氢原子E的同分异构体的结构简式：_________、________。

（5）写出由E转化为对甲基苯乙炔（）的合成路线流程（无机试剂任选）。合成路线流程图示例如下

（6）请写出你所写出的流程图中最后一步反应的化学方程式____________________________。

仅在非洲流行的血吸虫病为（）.

A．日本血吸虫病、曼氏血吸虫病 

B．曼氏血吸虫病、埃及血吸虫病 

C．埃及血吸虫病、湄公血吸虫病 

D．间插血吸虫病、日本血吸虫病 

E．湄公血吸虫病、日本血吸虫病

阅读理解。

     CBS News-Veteran(资深的)broadcast journalist Mike Wallace died at 93 on April 7, 2012. He 

 had been in declining health in recent years but the cause of death has yet to be released.

"It is with enormous sadness that we mark the passing of Mike Wallace," CBS president and CEO

Leslie said in a statement.  "His extraordinary contribution as a broadcaster is immeasurable. His loss

will be felt by all of us at CBS. "

     Wallace was a correspondent(记者)on the CBS News program"60 Minutes"from 1968 where

he earned a fame as one of the toughest interviewers in the business. He spent 38 seasons with the

program befor e announcing his retirement in 2006.

     "He loved being Mike Wallace,"CBS News chairman Jeff Fager said. "if he showed up for an

interview, it made people nervous. "He knew that he was going to get to the truth. And that's what

motivated him. "

     Over the years, Wallace sat down with seven U.S. presidents as well as other world leaders,

celebrities(名人),sports stars and controversial figures such as Malcom X and Dr. Jack Kevorkian.

Wallace also made his name as a war correspondent in the 1960s, covering Vietnam. He began his

journalism career in the 1940s as a radio broadcaster for Chicago Sun. He joined CBS News in

1951 and later returned to the network in 1963 after leaving in 1955. Wallace also appeared on

one-on-one interview show"Night Beat,"which later aired on ABC. During his remarkable career,

he won more 20 Emmy Awards and several other honors.

     News colleagues remembered Wallace fondly for his form and sharp reporting. "Mike's tough

questioning inspired generations of journalists. "ABC News President Ben Sherwood said in a

statement.

1. Which program was Wallace best known for?

A. Chicago Sun news.

B. ABC news.

C. 60 Minutes.

D. Night Beat.

2. The underlines word"that"in paragraph 4 refers to           .

A. winning Emmy Awards or other honors

B. making people he interviewed nervous

C. challenging people to reach the truth

D. loving showing up for an interview

3. Wallace didn't work for CBS News in the          .

A. 1970s

B. 1960s

C. 1950s

D. 1940s

4. What can be conclude from the comments on Mike Wallace in the passage?

A. His co-workers admires him for his sharp questions.

B. He loved to show off the truth got from the interviewees.

C. It was pleasant for people he interviewed to answer his questions.

D. He is best respected by his remarkable contribution in the war.

精氩塔投运时首先微量增加（），待精氩塔（）时，可适当减少（）放空量，最终直至（）全关。

大型交流电机在热状态下启动有何规定？