首页
登录
职称英语
A scientific discovery is often made【C1】______ before someone is able to pu
A scientific discovery is often made【C1】______ before someone is able to pu
游客
2023-11-23
54
管理
问题
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to split atoms decades【C3】______ the invention of the atomic bomb and the use of【C4】______ power to produce electricity. But sometimes discovery and【C5】______ happen at the same time, as occurred more than thirty years ago【C6】______ the discovery of coherent light and the invention of the laser.
The word laser【C7】______ "light amplification by stimulated emission of radiation. To many people, lasers are very mysterious, but a laser is simply a【C8】______ that produces a strong light. The light from the laser is called【C9】______ light because it is light that only moves in one direction.【C10】______ , incoherent light, like the light from the sun or light from a bulb, moves away from its source【C11】______ all directions, so its strength is very spread out. The light from a laser, moving in only one direction and【C12】______ in a narrow beam, is much stronger. Laser light is created by a【C13】______ called stimulated emission. In this process, the atoms of a certain substance, such as a crystal or a gas, are excited 【C14】______ that they produce coherent light. A person working with a laser can aim this coherent light,【C15】______ a laser beam, in any direction.
As soon as the laser was developed, scientists began thinking of practical applications【C16】______ it. One of the earliest uses was to make extremely precise measurements of distance and speed.【C17】______ , the distance to the moon was measured to within a foot, and the speed of light was measured to 【C18】______ a thousandth of a mile per second. As time【C19】______ , many more applications for the laser were【C20】______ . [br] 【C8】
选项
A、method
B、device
C、way
D、methodology
答案
B
解析
此题考查名词的用法。这个题的关键是:a laser是什么?显然它不是method和methodology,也不可能是way。这样用排除法就可以锁定B项device。其实看看laser的全称light amplification by stimulated emission of radiation,也可以得出这个结论。
转载请注明原文地址:https://tihaiku.com/zcyy/3211924.html
相关试题推荐
Ifyousawsomeonelyingonthegroundinpainorbleeding,wouldyoustopt
Ifyousawsomeonelyingonthegroundinpainorbleeding,wouldyoustopt
ThescientificnameistheHoloceneAge,butclimatologistsliketocallour
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Onecenturyago,intheyearbeforeFreudandJung’sfamousvisithere,Amer
随机试题
Povertyanddomesticviolencemakeiteasyforhertotrustthatbadthingswill
Readcarefullythefollowingexcerptonterm-timeholidayargumentsintheUK
[originaltext]W:I’dliketoseetheanexhibitiontomorrow,Canyoutellmewh
假设某公司拥有实物期权,并且可以投资具有正NPV的项目,那么公司市场价值与实体资
砂砾石和砂等非黏性土的填筑标准以()作为设计控制指标。A.压实度 B.密
患者.40岁。不慎被硫酸灼伤,Ⅲ度烧伤面积达45%.入院后应采用A.严密隔离
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性: A.如
西方谚语曾言:你可以牵马到河边,但不能强迫它饮水。这说明在心理辅导中,我们要做到
产品的包装、质量、品牌、特色和设计等属于产品层次中的()。A.扩展产品
地基加固中属于土质改良方法的是()A、换填 B、绳网 C、强夯 D、板桩
最新回复
(
0
)