standard units. These are either made at the building-site or at a factory. Some designers, in fact, are standardizing the dimensions of rooms. They are made in multiples of a single fixed length, usually ten centimeters. This is called a modular system, and it means that manufactures can produce standardized fittings at a lower cost. The most important fact about system building is its speed. A ten-storey flat, for example, can be completed in four months.
There are several new methods of system building. One is the panel method. In this case, the construction company sometimes erects a factory on the site. The walls and floors of the building, called panels, are cast in a horizontal or vertical position. Conduits for electrical wires and sleeves for pipes are cast in the panels when they are being made. The moulds for making these castings are situated all around the building.
After the concrete panels are cast, they are allowed to set and harden for a week. Next they are lifted by a tower crane on to any section of the building. There the panels are cemented together at their joints and the floor covering is laid.
After the panels have been cemented together, the crane lifts a case into the area. It contains all the fittings to be installed, such as wash-basins, radiators and pipes. Finishing tradesmen, such as plumbers, plasterers, painters and electricians, follow behind to complete the work.
In some building developments, in some countries, whole flats with internal features like their bathrooms, bedrooms and connecting stairs, and weighing as much as twenty tons, are carried to the building-site ready-made. A giant overhead crane is used to lift them into position. In the future, this method may become more widespread.
1. The main difference between panel method and the method discussed in the last paragraph is_______.
A. the latter uses ready-made internal features
B. panels are cast in a level position
C. the former is used to build walls and floors while the latter to construct bathrooms or bedrooms
D. the former is more expensive than the latter
22. Which of these statements is TRUE of system building?
A. It employs more men. B. It is difficult and dangerous.
C. It can save both time and money. D. It means less mechanization.
23. According to the passage, the principle of system building is that_______.
A. construction methods are safer
B. buildings are made from a set of standardized units
C. similar buildings can be produced
D. all units are produced on the site
24. The usual fixed length in the modular system is_______.
A. twenty centimeters B. ten millimeters
C. fifty centimeters D. ten centimeters
25. What lifts the concrete panels onto the building?
A. Cranes. B. Man-power.
C. Pulleys. D. Hydraulic jacks.
21. A 22. C 23. B 24. D 25. A
GRE作文高分词汇需要掌握多少?
GRE写作提纲举例指导(37)
GRE写作 Argument常用论证句
新GRE写作思路之正反立论
GRE写作:练习才是硬道理
ETS6分GRE写作Issue部分范文欣赏
GRE写作 V S SAT写作
GRE写作的重要性
新GRE写作范文之谈“成功”
GRE写作素材的积累、评估与运用
GRE写作例子怎么利用才算好
GRE写作的开头、论据、论证及结尾段指导
GRE写作的含金量多重?
GRE写作素材之丘吉尔
GRE写作常用例子
GRE写作替换词总结
关于GRE写作名人素材 哥白尼
让GRE官网告诉你什么是Analyze an Issue
GRE写作:作文满分30天备考方法
新GRE写作要有思想
如何备考GRE写作Issue部分
GRE写作提纲举例指导(40)
ETS4分GRE写作Issue范文欣赏
ETS官网GRE3分范文欣赏
GRE写作中的名言警句
GRE写作Issue题库
新GRE写作提升技巧
GRE写作备考:题库+规划+练笔
gre写作模板推荐
GRE写作该怎么运用模板
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |