已知向量a的模为4，向量b的模为7，向量a与向量b的夹角为60°，向量a与向量b的内积为（）

域名http://www.pdsu.edu.cn/由4个子域组成，其中哪个表示主机名。

梁平法中标注的KLL1（二A）表示是什么？

4、甲企业2017年5月份购入了一批原材料，会计人员在7月份才入账，该事项违背的是会计信息质量要求的（　）要求。

设集合A={1，2，3}，集合B={3，4，5},则A∩B=()

某人从梯子底端走到梯子顶端，第一次用了30s，第二次用了1min。他前后两次克服重力做的功（）

what'sthemeaningof"beresponsiblefor".

4．隔日交割，即在成交后的第一个营业日内进行交割的是（）

许先生认识张、王、杨、郭、周五位女士，其中：　　（1）五位女士分别属于两个年龄档，有三位小于30岁，两位大于30岁；　　（2）五位女士的职业有两位是教师，其他三位是秘书；　　（3）张和杨属于相同年龄档；　　（4）郭和周不属于相同年龄档；　　（5）王和周的职业相同；　　（6）杨和郭的职业不同；　　（7）许先生的老婆是一位年龄大于30岁的教师。　　请问谁是许先生的未婚妻？

4、影视中画面的构图决定了画面的平衡性，非常重要，构图处理中有哪几种基本画面形式（）。

4.数字媒体艺术形态的本性是（）

4.Themorefamiliaryoubecomewithyournewsurroundings,_______yourfeelingsofhomesicknesswillfade.

4.HowdidthestudentsfeelaboutJillWatson?

4. HowdidthestudentsfeelaboutJillWatson?

Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humidorpollutedoutsideair,theyposemanypotentialhealthhazards.Muchresearchhaslookedathowthemovementofairinsideaclosedenvironment---suchasanofficebuilding---canspreaddiseaseorexposepeopleinthebuildingtoharmfulchemicals.OneofthemorewidelypublicizeddangersisthatofLegionnaire’sdisease,whichwasfirstrecognizedinthe1970s.Thiswasfoundtohaveaffectedpeopleinbuildingswithair-conditioningsystemsinwhichwarmairpumpedoutofthesystem’coolingtowerswassomehowsuckedbackintotheairintake(通风口),inmostcasesduetopoordesign.Thewarmair,filledwithbacteria,wascombinedwithcooled,conditionedairandwasthencirculatedaroundvariouspartsofthebuilding.Studiesshowedthatevenpeopleoutsidesuchbuildingswereatriskiftheywalkedpastairexhaustpipes.Largeair-conditioningsystemsaddwatertotheairtheycirculatebymeansofhumidifiers(湿度调节器).Inoldersystems,thewaterusedforthisprocessiskeptinspecialreservoirs,thebottomsofwhichprovidebreedinggroundsforbacteriawhichcanfindtheirwayintotheventilation(通风)system.Therisktohumanhealthfromthissituationhasbeenhighlightedbythefactthattheimmunesystems(免疫系统)ofapproximatelyhalfofworkersinair-conditionedofficebuildingshavedevelopedtheabilitytofightofftheorganismsfoundatthebottomofsystemreservoirs.Butchemicalscalled“biocides”areaddedtoreservoirstomakethemgerm-free,andtheyaredangerousintheirownrightinsufficientquantities,astheyoftencontaincompoundsstronglylinkedtocancers.Finally,itshouldbepointedoutthattheartificialclimaticenvironmentcreatedbyair-conditionerscanalsoaffectus.Inanaturalenvironment,whetherindoororoutdoor,therearesmallvariationsintemperatureandhumidity.Indeed,thehumanbodyhaslongbeenaccustomedtothesenormalchanges.Inanair-conditionedlivingorworkingenvironment,however,bodytemperaturesremainwellunder37℃,ournormaltemperature.Thisleadstoaweakenedimmunesystemandthusgreaterexposuretodiseasessuchascoldsandflu.4.Theauthormostprobablywantsthereaderstotreatbiocideswithanattitudeof_.