双频手机具有什么样的特点？写出五种双频手机。
双频手机有摩托罗拉 V60、 V66、 V70、 T1720 型等；诺基亚有 N8210、N8250、N8850、 N8855 型等。双频手机可以在 GSM900 与 DCS1800两个频段工作。双频手机的上网速度较 GSM900 手机慢一些，因为手机在开机后是在两个频段上搜索基站信号，锁定最强的信号进入待机状态。
暂无解析
衡量胎先露下降程度的重要指标是：
关于正常分娩的临床表现，下列哪些不正确：
Whileintegrasedeletesanimmunecell'sgeneticmaterialandreplacesitwithitsown,itactslike________inawordprocessor.
PartIIICloze
Directions:Therearetwentyblanksinthefollowingpassage.Foreachblanktherearefourchoices.ChoosetheonethatbestfitsintothepassageandthenmarksyouranswerontheAnswerSheet.
Beforethe20thcenturythehorseprovideddaytodaytransportationintheUnitedStates.Trainswereusedonlyforlong-distancetransportation.
Todaythecaristhemostpopular61oftransportationinalloftheUnitedStates.Ithascompletely62thehorseasameansofeverydaytransportation.Americansusetheircarsfor6390percentofallpersonal64.
MostAmericansareableto65cars.
Theaveragepriceofa66madecarwas1050in1950,1740in1960andupto1750671975.DuringthisperiodAmericancarmanufacturerssetabout68theirproductsandworkefficiency.
Asaresult,theyearlyincomeofthe69familyincreasedfrom1950to197570thanthepriceofcars.Forthisreason71anewcartakesasmaller72ofafamily’stotalearningstoday.
In195173ittook8.1monthsofanaveragefamily’s74tobuyanewcar.In1962anewcar758.3ofafamily’sannualearnings.By1975itonlytook4.7576income.Inaddition,the1975carsweretechnically77tomodelsfrompreviousyears.
The78oftheautomobileextendsthroughouttheeconomy79thecarissoimportanttoAmericans.Americansspendmoremoneyto80theircarsrunningthanonanyotheritem.
61.A.kindsB.meansC.meanD.types
62.A.deniedB.reproducedC.replacedD.ridiculed
63.A.hardlyB.nearlyC.certainlyD.somehow
64.A.tripB.worksC.businessD.travel
65.A.buyB.sellC.raceD.see
66.A.quicklyB.regularlyC.rapidlyD.recently
67.A.onB.inC.behindD.about
68.A.raisingB.makingC.reducingD.improving
69.A.unusualB.interestedC.averageD.biggest
70.A.slowestB.equalC.fasterD.lessthan
71.A.bringingB.obtainC.boughtD.purchasing
72.A.partB.halfC.numberD.side
73.A.clearlyB.proportionallyC.percentageD.suddenly
74.A.incomeB.workC.plansD.debts
75.A.usedB.spendC.costD.needed
76.A.months’B.dollarsC.familyD.year
77.A.famousB.superiorC.fastestD.purchasing
78.A.runningB.noticeC.influenceD.discussion
79.A.thenB.asC.soD.which
80.A.startB.leaveC.keepD.repair
当正压人工呼吸与胸外按压配合进行时大约每分钟各多少次?
