疲劳英语单词
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king_wenwu 共回答了13个问题
|采纳率92.3%- bored
- 1年前
fairynoye 共回答了13个问题
|采纳率84.6%- 疲劳 [pí láo]
详
tired
fatigued - 1年前
bobby83wang 共回答了24个问题
|采纳率83.3%- tired。。
- 1年前
6450610 共回答了14个问题
|采纳率85.7%- tire
- 1年前
丢三落四 共回答了22个问题
|采纳率81.8%- tired;fatigued;fatigue;strain;fag
- 1年前
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- 金属疲劳
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|采纳率100%金属疲劳英文词条名:金属疲劳 在交变应力作用下,金属材料发生的破坏现象.机械零件在交变压力作用下,经过一段时间后,在局部高应力区形成微小裂纹,再由微小裂纹逐渐扩展以致断裂.疲劳破坏具有在时间上的突发性,在位置上的局部性及对环境和缺陷的敏感性等特点,故疲劳破坏常不易被及时发现且易于造成事故.应力幅值、平均应力大小和循环次数是影响金属疲劳的三个主要因素.1年前查看全部
- 如何减少金属疲劳现象?
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wangshixxx 共回答了19个问题
|采纳率100%在金属材料中添加各种“维生素”是增强金属抗疲劳的有效办法.例如,在钢铁和有色金属里,加进万分之几或千万分之几的稀土元素,就可以大大提高这些金属抗疲劳的本领,延长使用寿命.随着科学技术的发展,现已出现“金属免疫疗法”新技术,通过事先引入的办法来增强金属的疲劳强度,以抵抗疲劳损坏.此外,在金属构件上,应尽量减少薄弱环节,还可以用一些辅助性工艺增加表面光洁度,以免发生锈蚀.对产生震动的机械设备要采取防震措施,以减少金属疲劳的可能性.在必要的时候,要进行对金属内部结构的检测,对防止金属疲劳也很有好处.
附:金属疲劳原理是:金属在一定振幅下能承受多少次的震动,超过这个次数就超过了金属的疲劳极限,就会发生变行 如果振幅很大,就直接产生变形了,如果振幅很小,次数就可打到无限次
金属疲劳 在交变应力作用下,金属材料发生的破坏现象.机械零件在交变压力作用下,经过一段时间后,在局部高应力区形成微小裂纹,再由微小裂纹逐渐扩展以致断裂.疲劳破坏具有在时间上的突发性,在位置上的局部性及对环境和缺陷的敏感性等特点,故疲劳破坏常不易被及时发现且易于造成事故.应力幅值、平均应力大小和循环次数是影响金属疲劳的三个主要因素.1年前查看全部
- During sleep,the fatigue (疲劳) of the body disappears and rec
during sleep,the fatigue (疲劳) of the body disappears and recuperation ( 恢复) begins.the tired mind gathers new energy.once awake,the memory improves,and annoyance and problems are seen in a better perspective.
some adults require little sleep; others need eight to ten hours in every twenty-four.infants sleep sixteen to eighteen hours daily and,as they grow older,the amount gradually diminishes.young students may need twelve hours; university students may need ten.a worker with a physically demanding job may also need ten,whereas an executive worker under great pressure may manage on six to eight.many famous people are reputed to have required little sleep.napoleon,thomas edison and charles darwin apparently averaged only four to six hours a night.
whatever your individual need,you can be sure that by the age of thirty you will have slept for a total of more than twelve years.by that age you will also have developed a sleep routine:a favorite hour,a favorite bed,a favorite position,and a formula you need to follow in order to rest comfortably.investigators have tried to find out how long a person can go without sleep.several people have reached more than 115 hours nearly five days,whereas animals kept awake for from five to eight days have died of exhaustion.the limit for human beings is probably about a week.
(1).the writer implies that _________
a、sleep is important for good mental and physical health
b、a light sleep is as restful as a deep sleep
c、memory is improved during sleep
d、sleep is relatively unimportant for human beings
(2).from the amount of sleep napoleon,edison and darwin required,we can infer that_______.
a、they were famous great men
b、 they were executive workers
c、 they were intelligent people
d、 they were involved in mentally demanding work
(3).the amount of sleep required ________.
a、varies greatly from individual to individual
b、 depends on an individual''s age
c、 relates to an individual''s occupation
d、 all of the above.
(4).according to the passage,the sleeping routine will be built at the age of _________.
a、10
b、20
c、30
d、40
(5).from animal experiments,we can conclude that the final result of the lack of sleep is probably _________
a、mental illness
b、mental breakdown
c、susceptibility to illness
d、death
网上搜此题,发现有两种不同的答案,在百度知道问答里的是addcd,但是在百度文库的新视野补考卷中答案是bdbaa,一模一样的文章和问题,究竟哪个才是正确的啊!番外1001年前3
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|采纳率100%1.A
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详细解析:1年前查看全部
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