Merchant and passenger ships are generally required to have a life preserver for every person aboard and, in many cases, a certain percentage of smaller sizes for children. According to United States Coast Guard requirements, life preservers must be simple in design, reversible, capable of being quickly adjusted to fit the uninitiated individual, and must be so designed as to support the wearer in the water in an upright or slightly backward position.
Sufficient buoyancy to support the wearer should be retained by the life preserver after 48 hour in the water, and it should be reliable even after long period of storage. Thus it should be made of materials resistant to sunlight, gasoline, and oils, and it should be not easily set on fire.
The position in which the life preserver will support a person who jumps or falls into the water is most important, as is its tendency to turn the wearer in the water from a face-down position to an upright or slightly backward position, with his face clear of the water, even when the wearer is exhausted or unconscious.
The method of adjustment to the body should be simple, and self-evident to uninitiated persons even in the dark under the confused conditions which follow a disaster. Thus, the life preserver should be reversible, so that it is nearly impossible to set it on wrong. Catches, straps, and ties should be kept to a minimum. In addition, the life preserver must be adjustable to the wide variety of shapes and sizes of wearers, since this greatly affects the position of floating and the self-righting qualities. A suitable life preserver should also be comfortable to wear at all times, in and out of the water, not so heavy as to encourage to take it off on shipboard while the ship is in danger, nor so burdensome that it hinders a person in the water while trying to swim.
21.The passage is mainly about ________.
A) the uses of life preservers
B) the design of life preservers
C) the materials for life preservers
D) the buoyancy of life preservers
22.According to the passage, a life preserver should be first of all, ________.
A) adjustable
B) comfortable
C) self-evident
D) self-righting
23.United States Coast Guard does NOT require the life preserver to the made ________.
A) with as few strings as possible
B) capable of being worn on both sides
C) according to each wearers size
D) comfortable and light to wear
24.By the uninitiated individual the author refers to the person ________.
A) who has not been instructed how to use a life preserver
B) who has a little experience in using a life preserver
C) who uses a life preserver without permission
D) who becomes nervous before a disaster
25.What would happen if a person were supported by the life preserver in a wrong position?
A) The waves would move him backwards.
B) The water would choke him.
C) He would immediately sink to the bottom.
D) He would be exhausted or unconscious.
答案:DAADC
中考英语重要短语的用法及区别:agree with agree to
中考英语专题复习资料:阅读理解专项练习(四)
In my friends’ eyes I am a lucky dog. Beijing Foreign Studies完形填空答案
中考英语重要短语的用法及区别:borrow lend
中考英语重要短语的用法及区别:too much too many
中考英语重要短语的用法及区别:begin start
中考英语重要短语的用法及区别:in front of in the front of
中考英语重要短语的用法及区别:dress wear put on
中考英语重要短语用法及区别:say tell speak talk
2016年中考英语语法知识考点总结:动词
中考英语专题复习资料:阅读理解专项练习(三)
This selection of books and guides helps you appreciate阅读理解答案
中考英语重要短语的用法及区别:find look for find out
中考英语重要短语的用法及区别:take care of look after
中考英语重要短语的用法及区别:look see watch
中考英语重要短语的用法及区别:besides except but
中考英语重要短语的用法及区别:spend pay cost take
中考英语重要短语的用法及区别:bring take fetch
中考英语重要短语的用法及区别:because because of
九年级英语上册单元检测考试试卷Unit12(附答案)
中考英语重要短语用法及区别:join take part in join in
中考英语重要短语的用法及区别:sometime some time
中考英语专题复习资料:阅读理解专项练习(五)
中考英语重要短语的用法及区别:have sb. do
中考英语重要短语的用法及区别:as when while
中考英语重要短语的用法及区别:alone lonely
中考英语重要短语的用法及区别:ago before
中考英语重要短语的用法及区别:among between
Turn off the tap please. The water .A.was wastedB.wastesC.is及答案
2016年中考英语词组辨析:leave/ forget
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |