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.
参考答案:daadc
初中英语语法讲解 冠词的概念
初中英语句子的暗否定 一定要掌握哦
初中英语知识点视频讲解专辑 从句阅读作文等
中考英语 听力语法阅读及作文复习解析
中考英语语法定语从句和词汇短语集锦
冲刺中考英语 快解英语单项填空题六法
初中英语动词的过去现在将来时态一览表
中考英语名词冠词易错题精选
初中英语复习课 名师上课的9点注意
09中考英语作文备考技巧 行文连贯是高分法宝
中考英语重点词:have在中学英语里的用法
初中英语三年知识点梳理及练习
初中英语句子中常见的隐藏否定
08中考英语任务型阅读试题精选 集锦
中考英语分类总复习:书面表达训练
2009中考英语五大题型备考建议 考生必读
北京八中实验班上的“小牛人”怎样学英语?
初中英语语法 介词用法口诀大全1-5
09中考英语完型填空 妙招教你拿高分
初中英语学习方法及中考应试策略守则
初中英语必须掌握的几大时态
初中英语总复习 易混词盘点
中考英语听力技巧动词时态技巧复习方法
陈冬梅老师教你初中英语学习方法
英语语法必读法宝:动词名词各种形式集锦
英语词汇中考攻略:背诵是金记忆是银
人大附中实验班上的牛人怎样学英语?
初中英语常用词组复习200多个
09中考英语听力备考 5月该做真题了
初中英语13个易错表达
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |