首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The camera is often thought to be a modem invention. But as early 1727, a German physicist 【B1】______ that light darkens silver
The camera is often thought to be a modem invention. But as early 1727, a German physicist 【B1】______ that light darkens silver
admin
2013-03-11
12
问题
The camera is often thought to be a modem invention. But as early 1727, a German physicist 【B1】______ that light darkens silver salt in a chemical 【B2】______ . Using a camera, a big box with a small hole to let the light in, he made 【B3】______ images on the salt. Silver salt is still the 【B4】______ of film today. Then a French scientist made the first 【B5】______ picture by using a special 【B6】______ of metal sensitized with silver salt. A photography he made in 1826 still 【B7】______ . The painter, Daguerre improved on the process 【B8】______ placing common salt the kind we eat on the metal. This was in 1839, 【B9】______ , but the problem was the printing of photographs, and it wasn’t until other scientists developed the kind of paper we now use, that good printing was possible and photograph become truly modem. In 1860, Matthew Bradey was able to take his famous pictures of the American Civil War, 【B10】______ . In the 20th century, George Eastman of the United States simplified film developing, and Dr. Edwin Land invented the so-called "instant" camera with self developing film. 【B11】______ it has taken more than one hundred years for the camera to reach its present condition of technical refinement.
【B3】
选项
答案
temporary
解析
转载请注明原文地址:https://jikaoti.com/ti/JUwFFFFM
0
大学英语四级
相关试题推荐
Tosleep.Perchance(古英文,或许)tofile?FindingspublishedonlinethisweekbytheProceedings(文献汇编)oftheNationalAcademyofS
Alotofpeoplenowadayshavemuscularproblemsintheneck,theshouldersandtheback______(主要是由于工作中的压力和紧张造成的).
A、Readthebookquickly.B、Speakslowly.C、TellhimmoreabouttheIceAgesocieties.D、Lendhimthemagazine.D男士以比较委婉的方式向女士借书,
A、HeprefersGermanytootherEuropeancountries.B、Hepreferslargenoteswhentraveling.C、He’drathertaketraveler’schecks
A、Becausehewasthoughttobeawareofcountlessplanecrashes.B、Becausehewasbelievedtohavelikedbus-riding.C、Becauseh
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualfueloil,andlubricatingoils,comefromonesource-
Asinthefieldofspacetravel,soinunderseaexplorationnewtechnologiescontinuetoappear.Theyshareanumberofsimilari
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【C1】______toallof
A、Sheisamedicalexpert.B、Sheknowsnothingabouttheregulationsofmedicineadvertisement.C、Shewillhavetothinkofnew
TheInternetisaninternationalcollectionofcomputernetworksthatallunderstandastandardsystemofaddressesandcommands
随机试题
试述融资租赁的特点和优缺点。
下列案件的受理的说法哪一项是正确的?()
下列有关反垄断调查的说法错误的有:()
下列支出中,属于施工企业营业外支出的是()。
中国的中央银行成立于()。
单个厂商的供给受多种因素的影响,主要有:()。
王老师是学校的模范教师,他上每一堂课之前总会先和学生交流一下,了解大家的情况然后再设计教学过程,设计一些启发学生的点,然后在教学过程中也会不断地启发学生去思考,调动学生的主动性。这体现了王老师遵循教育过程的()。
H市M县人民政府为了对石膏产业进行转型升级,要求有关部门对小型的以及证照不全的石膏生产企业全部予以关停,其余五家证照齐全的大中型石膏生产企业合并,与引进的投资商张某共同组建Q公司,由Q公司独家生产石膏。Q公司的股权配置是:五家大中型石膏生产企业各占12%的
设,当a,b为何值时,存在矩阵C使得AC—CA=B,并求所有矩阵C.
()日期邮戳()请转发()邮寄名单()邮资已付
最新回复
(
0
)