天然气集输系统的特点是气体在()的管道里进行连续输送。 A.敞口 B.密闭

题型:单项选择题

问题:

天然气集输系统的特点是气体在()的管道里进行连续输送。

A.敞口

B.密闭

C.环状

D.单线

考点:燃气知识综合题燃气知识综合题题库
题型:单项选择题
任务型阅读(共10小题,每小题1分,计10分)
Have you ever wondered what an American high school is really like? This article will describe a typical (典型的) high school and its students.
A typical American high school has several large buildings and enough space for about 1,500 students. Every student is given a locker. When students first arrive at school, they go straight to their lockers to put away or get their textbooks and to hang up their outdoor clothes. As American textbooks are expensive, students would rather loan(租借) than buy them. Students must pay back if they lost any of them.
American students have different types of school transport. They usually take a yellow school bus or walk to school if they live close enough. Sometimes their parents drive them to school. When they turn 16 years of age, most take a free driving class at school for one term. If students earn passing grades in the class and also pass their state driver’s exam, they can begin driving themselves to school.
Each day, students take six or seven classes. They must take science, math, English and social studies. They can choose art, homemaking, fashion design and other classes. In some schools students are required to take one or more of the following special classes: health education, physical education or foreign language studies. Students move to different classrooms for each subject. This is because each teacher has their own classroom. There is a five-minute break between classes, to give the students the time to hurry to their next class.
The regular school day usually ends early in the afternoon. After school more than half of the students are involved in after-school activities. These activities include sports-especially football, basketball, baseball and soccer or clubs, such as yearbook, speech, school newspaper, photograph or student government.
Title:      小题1:    in an American High School
Outline
Details
Introduction
◇It gives an overview of a typical American high school and its  小题2:   .
Lockers and textbooks
◇Every student has a locker for textbooks and   小题3:  clothes.
◇They prefer loaning textbooks to   小题4:   them.
  小题5:   transport
◇Students usually go to school by bus or on foot. Sometimes their  小题6:   send them to school by car.
◇They can   小题7:   themselves to school when they are over 16 and have passed the required tests.
Classes and classrooms
◇Students have to take main classes, elective classes and sometimes one or more
     小题8:  classes.
◇They go to   小题9:   classrooms for each subject.
After-school activities
◇After school most of the students take  小题10:   in their faviourite activities, including sports and clubs.
 
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大便难解,多见于产后、手术后和体虚之人的津亏血燥便秘可用()

A.六磨汤

B.半硫丸

C.附桂八味丸

D.润肠九

E.麻子仁丸

题型:单项选择题

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题型:单项选择题

“五同时”是指在计划、布置、监督、总结和评比生产工作的同时计划、布置、监督、总结和评比安全工作。

题型:单项选择题

某学者为了研究某种疾病的危险因素,他将研究人群随机分组,并亲自控制实验组的研究条件,设立具有均衡性的对照组,采用盲法观察结果,他最可能使用的方法是()。

A.抽样调查

B.病例对照研究

C.前瞻性队列研究

D.流行病学实验

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