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棱长是6厘米的正方体表面积和体积相等． ．（判断对错）
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圆柱体的体积与圆锥体的体积比是31．．判断对错
用一根60厘米长的铁丝可以折成一个长8厘米宽5厘米高厘米的长方体．
与的和的是
Theswim﹣with﹣dolphinstouristindustryisbecomingmorepopulareveryyear.Afterallitcancostalargeamountofmoneytohavethiskindofholidayexperience.Sotouroperatorstrytoplaceeagerswimmersasnearaspossibletothedolphins. Researchhasshownthatdolphinsdonotlikeitatalliftheswimmersslipintothewaterdirectlyontopofthemorifhumansareintheirpathoftravel.Howeverifswimmersenterthewatertoonesideofthemthedolphinsdonotavoidtheswimmerstothesameextent. Inallcasesthedolphinsseemtohavebecomemoresensitivetothepresenceoftheswimmers.Fordolphinsswimmingamongstorwithhumansisnotnecessarilyahighpriority.Thisstudyhasshownthatonly19%ofanygroupofdolphinswillparticipateininteraction.Youngdolphinsarethemostlikelytointeract.Itisbelievedthattheyseehumansasentertainmentandthattheinteractionisanewandunusualexperienceforthem. Itisfrequentlyaskedwhetherswim﹣with﹣dolphinstourismshouldbediscontinued.Theadviceisthatdolphinsshouldbegivenenoughperiodsoftimethroughoutthedaywhentheyarenotexposedtotourism.Permittedinteractionsshouldnotbetoodisturbingtothedolphinssincetherecouldbemothersandcalves幼崽presentindolphingroups.Thereshouldalsobeeducationalcampaignsaboutthecreaturesandwhatislikelytocausedangertothem. Itisnoteasytoexplaintosomeonethattheycannotfulfilltheirlifelongdreamsbecausethedolphinsarerestingorthatamotherdolphinandcalfareinthearea.Butifwearetoenjoytheseremarkableanimalsandnotjustusethemforourentertainmentthenwemustcarefullymonitortheswim﹣with﹣dolphinsindustryworldwide. 28.Whatmakesswim﹣with﹣dolphinstourismpopular? A.Thelocalgovernment'sencouragement. B.Theimprovementofpeople'slivingstandard. C.Theincreasingnumberoftourists. D.Thehighprofitsoftheindustry. 29.Whyareyoungdolphinsmorelikelytoswimwithhumans? A.Theydothisoutofcuriosity. B.Theylikehumansbetter. C.Theyarelesssensitive. D.Theyarefearless. 30.Whatshouldtheswim﹣with﹣dolphinsindustrydoaccordingtoParagraph4? A.Avoidinteractionwithyoungdolphins. B.Makepeopleknowthehiddenthreattodolphins. C.Strictlylimittheexpansionoftheindustry. D.Exposedolphinstotouristsonlyinthedaytime. 31.Whatcanbeinferredfromthelastsentenceofthepassage? A.Theindustryhasbeenahottopicworldwide. B.Theindustryaimstobringhappinesstohumans. C.Theindustryenableshumanstoswimwithdolphins. D.Theindustrywillharmdolphinswithoutpropercontrol.
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将一块圆锥形糕点沿着高垂直于底面切成两半表面积比原来增加了36cm2测得圆锥形糕点的高是9cm．原来这块圆锥形糕点的体积是多少立方厘米
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