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
One reason human beings can thrive in all kinds of climates is that they can control the qualities of the air in the enclosed sp
One reason human beings can thrive in all kinds of climates is that they can control the qualities of the air in the enclosed sp
admin
2010-05-25
48
问题
One reason human beings can thrive in all kinds of climates is that they can control the qualities of the air in the enclosed spaces in which they live. Air conditioning is the use of mechanical systems to 【C1】______ that control in such places 【C2】______ homes, offices, theaters, institutions, factories, airplanes, and automobiles. The most familiar type of air conditioning is summertime cooling., Although important, this is 【C3】______ one of several aspects of air conditioning. Other applications 【C4】______ the control of the humidity (or air moisture), cleanliness, circulation of the air, and heating.
Tests have 【C5】______ that people generally feel best 【C6】______ certain temperature, humidity, and air velocity conditions. Temperatures can 【C7】______ from 21.5°C with 70 percent relative humidity to 28°C with 30 percent relative humidity. Relative humidity is the 【C8】______ of moisture in the air 【C9】______ a specific temperature compared 【C10】______ the amount it could hold at that temperature. 【C11】______ air velocities range from 4.5 to 10.5 meters per minute. It is also desirable that an air conditioner 【C12】______ dust, pollen, smoke, and odors from the air.
In many industrial environments, air conditioning is essential. Most print shops, for example, 【C13】______ . constant humidity in order to control paper shrinkage and 【C14】______ the 【C15】______ operation in some processes. Libraries, especially ones With rare books, require air control to 【C16】______ the physical quality of their collections. Bakeries and the tobacco and cotton industries require high humidity 【C17】______ their products, and perishables such as fruits must be stored in cool, dry rooms. Some electronic components, drugs, and chemicals must be manufactured 【C18】______ the air is as free as possible 【C19】______ dust and other particles. Air conditioning is 【C20】______ in hospitals, especially in operating rooms.
【C14】
选项
A、ensures
B、ensure
C、ensuring
D、to ensure
答案
D
解析
题型:语法题(动词不定式的承前省略)。在本句中,to control和to ensure作并列目的状语。
转载请注明原文地址:https://jikaoti.com/ti/wR8MFFFM
0
专业英语四级
相关试题推荐
Whatisthemanmainlytalkingabout?
Doyourealizethateverytimeyoutakeastep,thebonesinyourhiparesubjectedtoforcesbetweenfourandfivetimesyourb
Scientistsaroundtheworldareracingtolearnhowtorapidlydiagnose,treatandstopthespreadofanew,deadlydisease.SAR
Itis______unlikelythattherebellionforceswillsurrendertotheGovernment.
Theenergygained-fromthesuncanthenbeusedduringthenighttoenablethenecessarychemicalreactionsto______inhisbod
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments,spendtheirtime【C2】______theoccurrenceofearthq
WhichisNOTtheRussiangovernment’sactionaftertherescue?
Expandeduseofcomputertechnology,developmentofstrongerandlightermaterials,andresearchonpollutioncontrolwillprodu
Oneofthemostcriticalproblems【C1】_____blackandotherminorityAmericanstodayisthedifficultyofentering【C2】_____socie
随机试题
在我国全面发展教育的组成部分中。体育的根本任务是()
心脏病孕妇最容易发生心力衰竭的时期是()
用氟原子置换脲嘧啶5位上的氢原子,其设计思想是
为了提高用电设备的功率因数,通常使用()。
目前爆破工程中常用的非电起爆方法包括()。
财政补贴的主要对象是()。
甲企业与乙银行签订借款合同,借款合同约定:甲企业向乙银行借款1000万元,借款期限自2016年1月1日至2016年12月31日。甲企业将其现有的以及将有的生产设备、原材料、半成品、产品一并抵押给乙银行,双方于2016年1月4日签订了书面抵押合同,并于201
HowdoyouexplaineconomicsinplainEnglish?TheFederalReserveBankofNewYorkhasbeenansweringthequestionwithaneven
Themetricassignedtoeachnetworkdependsonthetypeofprotocol.Somesimpleprotocol,likeRIP,treatseachnetworkasequals.
PASSAGETHREEWhydoestheauthorquotethenovel"ThePioneers"?
最新回复
(
0
)