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
13
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] 【C7】
选项
A、is
B、signals
C、stands for
D、indicates
答案
C
解析
此题考查动词的用法。英文中说一个缩写词或者一个字母“表示”一个词,用stand for。例如:I know your name is Dean E Bella,but what does E stand for?又如:BBC stands for the“British Broadcasting Corporation”.(BBC的全称是British Broadcasting Corporation)。所以,只有C项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3211923.html
相关试题推荐
Ifyousawsomeonelyingonthegroundinpainorbleeding,wouldyoustopt
ThescientificnameistheHoloceneAge,butclimatologistsliketocallour
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Before1973,abortionwasillegalinAmericaunlessthewoman’shealthwas
Onecenturyago,intheyearbeforeFreudandJung’sfamousvisithere,Amer
Onecenturyago,intheyearbeforeFreudandJung’sfamousvisithere,Amer
Onecenturyago,intheyearbeforeFreudandJung’sfamousvisithere,Amer
随机试题
A、Talkwitholderbrothersorsisters.B、Haveacasualtalkwithacollegestude
Whentheheartbreaksdown,itbeatsirregularlyornotatall.Abonecanc
下述社会关系中属行政法调整范围的是( )。 A.各社会组织内部的管理关系
A.脾胃阳虚证 B.风水相搏证 C.脾肾阳虚证 D.寒湿困脾证 E.肾虚
以下出现中枢性呕吐的是A、肠梗阻 B、急性胰腺炎 C、急性胆囊炎 D、胆石
有下列()情形之一的,封闭式基金应当终止上市。 A.基金合同期限届满 B.
尤某因涉嫌强奸被县公安局拘留,县检察院批准逮捕并提起公诉,后被县法院判处有期徒刑
阿司匹林用于A.术后剧痛 B.胆绞痛 C.胃肠绞痛 D.肌肉痛 E.胃肠
根据《标准施工招标文件》,下列工作属于承包人应承担的义务是( )。A.及时完成施
下列经营活动中属于商业银行中间业务特点的是()。A.运用银行自有资金开展业
最新回复
(
0
)