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
2023-11-19
30
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] 【C18】
选项
A、within
B、with
C、from
D、less
答案
A
解析
此题考查的是“精确到…”的说法。这种说法要用to within。例如:accurate to within plus or minus one per cent精确到正负l%以内。所以,只有A项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3200954.html
相关试题推荐
ThespaceshuttleDiscoverycompleteda______missionuponitsreturntoKenned
ThespaceshuttleDiscoverycompleteda______missionuponitsreturntoKenned
Onewaytoconservewateristo______dishes,insteadofrinsingthem,beforel
Beforetheplane_________,thepilotbailedout.A、clashedB、crashedC、smashedD
WhatdidSecretaryofStateColinPowellannounceddaysbefore?[br][originalt
Howmanyyearswillitbebeforetheworldrunsoutofoil?Thequestioni
Howmanyyearswillitbebeforetheworldrunsoutofoil?Thequestioni
Howmanyyearswillitbebeforetheworldrunsoutofoil?Thequestioni
WhatcanweinferaboutMikebeforehewenttothecampingschool?[br][origin
WhatcanweinferaboutMikebeforehewenttothecampingschool?[br][origin
随机试题
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
期货交易所对期货交易、结算、交割资料的保存期限应当不少于()年。A、10B、5C、15D、20D《期货交易所管理办法》规定,期货交易所对期货交易
Thephrase"thetwosmallFrenchkids"isA、endocentricconstruction.B、coordinat
对商业银行债权的风险权重规定为:商业银行之间原始期限在4个月以内的债权给予零风险
肉、蛋等食品腐败变质后有恶臭,是食物中( )分解所致。A.脂肪 B.碳水
A.膈俞 B.石门 C.章门 D.期门 E.血海三焦的募穴是()
销售准备中应对销售人员应进行的工作内容主要有()。A.确定销售团队 B.销
A.①③④ B.①③⑤ C.②③⑤ D.②③④
一般而言,下列有关外汇期权交易的表述中,正确的有( )。A.外汇期权的交易对象
某油田企业2021年9月将一台采油车的固定装置拆除后用于运输。该车辆使用年限为1
最新回复
(
0
)