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设t>0,则t→0时,dxdy是t的n阶无穷小量,则n为( )
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2.
4.
6.
8.
确定如下无穷小的阶n当x→0时3x-4sinx+sinxcosx与xn为同阶无穷小则n=______
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1
2
3
4
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设fx有连续的导数f0=0f’0≠0Fx=x2-t2ftdt且当x→0时F’x与x3是同阶无穷小则k
1
2
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4
设t>0则t→0时[*]dxdy是t的n阶无穷小量则n为
2
4
6
8
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Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
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Directions:Readthefollowingtext.Choosethebestwordsfor eachnumberedblankandmarkABCorDonANSWERSHEET1. Mostplantscanmaketheirownfood fromsunlight1somehavediscoveredthatstealingisan easierwaytoliveThousandsofplantspeciesgetby2 photosynthesizingandover400ofthesespeciesseemtoliveby pilferingsugarsfromanunderground3offungi真菌.But in4ahandfuloftheseplantshasthismodusoperandibeen tracedtoarelativelyobscurefungus.Tofindouthow5 are6mycologistMartinBidartondoofthe UniversityofCaliforniaatBerkeleyandhisteamlookedintheirroots.What theyfoundwere7ofacommontypeoffungusso 8thatitisfoundinnearly70percentofallplants.The presenceofthiscommonfungusintheseplantsnotonly9 athowtheysurvivesaysBidartondobutalsosuggeststhat manyordinaryplantsmightprosperfromalittlelootingtoo. Plantshave10relationstogetwhattheyneedto survive.Normal11plantscanmaketheirowncarbohydrates throughphotosynthesisbuttheystillneedminerals.Mostplantshave 12asymbioticrelationshipwitha13 networkofwhatarecalledmycorrhizalfungiwhichliesbeneaththe forest14.Thefungihelpgreenplantsabsorbminerals throughtheirrootsand15theplantsnormally 16thefungiwithsugarsorcarbon.Withanumberofplants sharingthesamefungalwebitwasperhaps17thatafew cheaters—dubbedepiparasites—wouldevolvetobeatthesystem.18 theseplantsreversedtheflowofcarbon19it intotheirrootsfromthefungi20releasingitas payment.
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