问题 单项选择题 案例分析题

背景:某工程用混凝土,经和易性调整、强度校核及表观密度测定,确定其单位用水量为190Kg,砂率宜用0.34,水灰比应用0.50,该混凝土的表观密度为2400kg/m3。

(一)计算该混凝土的试验室配合比。

(二)若该项混凝土用42.5强度等级的普通水泥(实测强度为48.0MPa)、碎石、中砂,估算其28天抗压强度。

(三)若掺用木钙减水剂,经试验减水率15%,计算每立方米混凝土的水泥用量。

(四)若施工现场砂含水率为3%,石子含水率为1%,计算施工配合比。

(五)若用I级粉煤灰取代部分水泥(取代率20%,超量取代率1.5),试调整其配合比(根据问题一所计算的试验室配合比)

附:

采用碎石时:αa=0.46,αb=0.07

几种材料的视密度:砂为2.68g/cm3水泥为3.0g/cm3粉煤灰为2.2g/cm3)。

掺用减水剂后,每立方米混凝土水泥用量为()。

A:320kg

B:323kg

C:330kg

D:333kg

答案

参考答案:B

阅读理解

阅读理解。

     Texico High School is renewing its professional arts program.

     For years, one teacher taught the professional arts and was in charge of the Future Farmers of America

and Leadership programs. This year, community and school leaders decided to give the professional arts

program more attention.

     The school decided to bring back the program after a survey of the students. The students wanted

professional arts classes. To lead the program, the school invited Terry Whitener. Whitener taught leadership

and professional arts in Anthony, Texas.

     "It is difficult to do both well," he said. Whitener took carpentry (木工活) classes while he attended Texico

High School. "There were a lot more activities back in the 1980s than when I came here this year," he said.

     The school has bought new equipment for the carpentry workshop for Whitener's classes.

     Whitener said the classes were to give the students a leg up when they left high school "Not all students

are going to college," he said. "Even if they do, this program gives them helpful skills." Whitener said he wanted

to teach students carpentry classes from a career (生涯) standpoint (立场).

     "Measure twice, cut once. I tell them no boss is going to want to pay them to do a job twice, when they

could do it right the first time," he said. "Traditionally, all the guys were going to be farmers. That's not true

anymore. More kids will use these skills in a career instead of on their own field."

     "This is something I'm going to do after high school," said Zayne Meeks, one of Whitener's students. "It

gives people better opportunities to get better experience and then a better job."

     Another student, Lucas Waltners, said he was unsure of what he wanted to do after high school, but that

the skills learned in Whitener's class would be helpful either way. "This is something I'll know how to do if I

ever need to do it," he said.

1. What is "the Future Farmers of America"?

A. It's a farm.

B. It's a school.

C. It's a program.

D. It's a company.

2. Which of the following is TRUE about Whitener?

A. Whitener is a leader of the school in Anthony, Texas.

B. Whitener was a teacher who taught leadership and professional arts in Anthony, Texas.

C. Whitener learnt carpentry from his parents when he was in High School.

D. Whitener wants the students who attend his carpentry classes to be farmers in the future.

3. From the passage we know that Whitener's classes are to help the students _____.

A. prepare for their future life in some way

B. learn how to do carpentry work well only

C. how to find jobs in the future

D. how to become a leader

4. The best title for this passage may be _____.

A. Texico High School activity back in the 1980s

B. Carpentry classes in Texico High School

C. Texico school renews professional arts program

D. Future farmers training

单项选择题 A型题