首页
登录
职称英语
A scientific discovery is often made 【C1】______ before someone is able to p
A scientific discovery is often made 【C1】______ before someone is able to p
游客
2024-10-24
46
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] 【C13】
选项
A、process
B、way
C、period
D、device
答案
A
解析
此题考查名词的用法。看到该句中的同位语stimulated emission,就可以得出结论:激光是一个“过程"(process),而不是“方法”(way)、“时间段”(period)或者“装置/机制”(device)。故A项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3815511.html
相关试题推荐
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
随机试题
Whereisthemangoing?[originaltext]M:Anna,Iamgoingtotheheadquartersno
[originaltext]M:Hello,Lucy.ThisisMac.Howareyou?W:Fine,thankyou.Ab
Successoftendependsonyourperformanceataninterview.Forthosewhoar
下列说法,不能解释高频电磁波在人体内引起热作用的一项是A.磁场使人体内的分子重新
预防医学不同于临床医学,其特点为()。A.预防医学的工作对象包括个体及确定的
“多劳多得”体现了()。A.合理合法 B.对内公平 C.对外公平
下列关于固定资产投资项目的最低资本金比例的说法中,正确的有()。A.保障性住房
按照保险金额进行赔偿B:按照保险金额扣除残值后进行赔偿 C:支付修理费将保险财
内因子的作用是( )。A.保护维生素B12并促使其吸收 B.使蛋白质变性
传导速度最快的是() A.窦房结 B.心房肌 C.浦肯野纤维 D.房室结
最新回复
(
0
)