（）比15多1，（）比15少1。

坐位牵引的重量因为体重的 A: 1/15~1/3 B: 1/15~1/4 C: 1/15~1/5 D: 1/10~1/4

AVClip15:DailyVitaminNoGoodAV15DailyMultivitamin.aviWatchthevideoclipthreetimesandcompletethecontentofthestudybyfillingineachblankwiththewordfromthevideoclip.1.Formillionsofustheyarepartsofourdailyroutine,whichiswhyfindingsofthenewstudyaresohardto________.Researchersarenowreportingthatforolderwomensomevitaminsmightactuallybe________.Thestudywantedon40,000womenaged55through69overthecourseof19years,findingthatolderwomenwhotookmultivitamins—B6,folicacid,magnesium,zincorcopperwereata________increasedriskofdeath.About2.4%diedofthingslikeheartdiseaseandcancer,withwomenwhotook________havinga3.9%increaseriskofdeath.2.Thereport________otherstudiesthatfoundthatcertainothersupplementsmaybeharmful.Dietarysupplementsdon’trequirethesame________testingthatdrugsdo.Butitisan11-billion-dollar-a-yearbusinessasmillionsofAmericansareconvincedoftheir________.Andtodaytheleadingtradeassociationthat________themakersofdietarysupplementswasquicktofightback,issuingastatementthatthestudywas________anddidnotprovethatsupplementscausedanyharm.It’simportanttokeepinmindthatthisisan________,notacause-and-effectstudy.Addingthatwell,itmaymakeforinterestingscientificwatercoolerdiscussion,andcertainlydoesnotwarrantsweeping,overstated________forelderlywomen.3.Andthestudyhadonenotable________—calcium.Researchersfoundthecalciumsupplementsactually________mortalityrisk.Soeveryoneisaskingwhatshouldyoudowhenonedoctorwespoketothisafternoonsaidthatthereisstillalotmoreresearchthatshouldbedoneinthisarea.Butrememberthe________ofhealthy,balanceddiethavebeenshownoverandoveragain.Soit’snotaseasyasapill,butit’sproven.

下列( )是15的所有因数集合. A: {-15,-5,-3,-1} B: {-5,-3,-1,1,3,5} C: {1, 3, 5, 15} D: {-15,-5,-3,-1, 1,3,5,15}

基桩静载试验，每级加载量一般为预估最大荷载的( )。 A: 1/10～1/5 B: 1/15～1/5 C: 1/15～1/8 D: 1/15～1/10

一般汽车的前轮外倾角为（）左右。 A: 15°~4° B: 0°~15° C: 1° D: 1°~15°

混凝土的抗拉强度是抗压强度的（）。 A: 1/5～1/10 B: 1/10～1/20 C: 1/15～1/20 D: 1/10～1/15

执行如下命令的输出结果是 ?15%4, 15% -4 A: 3 -1 B: 3 3 C: 1 1 D: 1 -1

沪深交易所的集合竞价时间为()。 A: 上午9:15至9:25 B: 上午9:15至9:30 C: 下午1:00至1:15 D: 下午1:15至1:30

小儿心肺复苏时胸外心脏按压与人工通气之比为（）。 A: 15：1 B: 15：2 C: 15：3 D: 2：15 E: 1：15