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I.20世纪60年代,澳大利亚两位科学家用14C标记的14C02供玉米光合作用,发现了另一条有机物合成途...
问题详情: I.20世纪60年代,澳大利亚两位科学家用14C标记的14C02供玉米光合作用,发现了另一条有机物合成途径(如图1)。研究发现,玉米的叶肉细胞和维管束鞘细胞中都有叶绿体,但只有后者的叶绿体中有淀粉生成。图2表示玉米...
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I'vewrittenalotabouthabits.Afteralltheseyears,I'vecomet...
问题详情:I'vewrittenalotabouthabits.Afteralltheseyears,I'vecometoknowthere'sonethingthatseemsmoreimportantthananythingelse.It'ssimplythis:enjoythehabit. 36 Butyou'dbesurprisedhowmanypeop...
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(1+i)20-(1-i)20的值是
问题详情:(1+i)20-(1-i)20的值是________.【回答】0知识点:数系的扩充与复数的引入题型:填空题...
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-I'msorry,Iforgottopastthecardforyou.-Nevermind,I
问题详情:-I'msorry,Iforgottopastthecardforyou.-Nevermind,I___postittomorrow.A.amgoingB.amgoingtoC.willgoD.go【回答】C知识点:动词时态题型:选择题...
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已知复数z=1+i,则=( )A.-i B.+i C.--iD.-+i
问题详情:已知复数z=1+i,则=( )A.-i B.+i C.--iD.-+i【回答】A知识点:数系的扩充与复数的引入题型:选择题...
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i是虚数单位,=( )A.-i B.+iC.+i D.-i
问题详情:i是虚数单位,=()A.-i B.+iC.+i D.-i【回答】B知识点:数系的扩充与复数的引入题型:选择题...
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.复数z=-i(i+1)(i为虚数单位)的共轭复数是( )A.1+i B.1-i C.-1+i ...
问题详情:.复数z=-i(i+1)(i为虚数单位)的共轭复数是()A.1+i B.1-i C.-1+i D.-1-i【回答】A【解析】z=-i(i+1)i=1-i,∴其共轭复数为1+i.知识点:数系的扩充与复数的引入题型:选择题...
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计算:A.3+i B.-3-i C.-3十i...
问题详情:计算:A.3+i B.-3-i C.-3十i D.3-i【回答】B知识点:数系的扩充与复数的引入题型:选择题...
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设复数z满足,则=( )A.﹣2+i B.﹣2﹣i C.2+i D.2﹣i
问题详情:设复数z满足,则=()A.﹣2+i B.﹣2﹣i C.2+i D.2﹣i【回答】C【考点】复数代数形式的混合运算.【专题】计算题.【分析】先设出复数的代数形式,再由题意求出复数z,根据共轭复数的定义求出即可.【解答】解:设z=a+bi(a、b∈R),由...
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A.2+i B.2-i C.-1+i D.-1-i
问题详情:A.2+i B.2-i C.-1+i D.-1-i【回答】D知识点:数系的扩充与复数的引入题型:选择题...
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i是虚数单位,复数=( )A.1-i B.-1+iC.+i D.-+i
问题详情:i是虚数单位,复数=()A.1-i B.-1+iC.+i D.-+i【回答】A知识点:数系的扩充与复数的引入题型:选择题...
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复数的共轭复数=( )A.1+i B.﹣1﹣i C.﹣1+i D.1﹣i
问题详情:复数的共轭复数=()A.1+i B.﹣1﹣i C.﹣1+i D.1﹣i【回答】D【考点】A5:复数代数形式的乘除运算;A2:复数的基本概念.【分析】根据所给的复数的表示形式,进行复数的除法运算,分子和分母同乘以分母的共轭复数,整理出...
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I'msorryI'mbusynow.IfIhadtime,I
问题详情:I'msorryI'mbusynow.IfIhadtime,I______forapicnicwithyou.A.wouldgo B.willgo C.amgoing D.went【回答】A知识点:虚拟语气题型:选择题...
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.i为虚数单位,z=,则i的共轭复数为( )A.2﹣iB.2+i C.﹣2﹣i D.﹣2+i
问题详情:.i为虚数单位,z=,则i的共轭复数为()A.2﹣iB.2+i C.﹣2﹣i D.﹣2+i【回答】A【考点】复数代数形式的乘除运算.【专题】数系的扩充和复数.【分析】利用复数代数形式的除法运算化简z,由共轭复数的概念得*.【解答】解:z==,∴复数z的...
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运行以下程序时,执行循环体的次数是( ).i=1Do i=i+1 i=i*iLoopWhilei<10输出i...
问题详情:运行以下程序时,执行循环体的次数是().i=1Do i=i+1 i=i*iLoopWhilei<10输出iA.2 B.10 C.11 D.8【回答】A第一次执行循环体,i=1,i=i+1=2,i=i·i=4,i=4<10,成立第二次执行循环体i=i+1=5i=i·i=25i=25<10,不成立,退出循...
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Inmylife,I'vebeentoldthatteamworkisgolden.Thereisno"i"i...
问题详情:Inmylife,I'vebeentoldthatteamworkiseisno"i"in"team"formanyyearsitisngalonegetsabadrapinourI'vefoundthatlivingalonecanbeapositiveexperience.I'mnotthefirstpersontonoticetheappealofbeingou...
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—I'dliketobooktwoticketstoBerlin.—I'msorryto
问题详情:—I'dliketobooktwoticketstoBerlin.—I'msorryto_____you,buttherearen'tanyticketsleft.A.bore B.frightenC.disappoint D.interrupt【回答】C知识点:动词题型:选择题...
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复数z=i(i+1)(i为虚数单位)的共轭复数是( )A.-1-i B.-1+I C.1-i ...
问题详情:复数z=i(i+1)(i为虚数单位)的共轭复数是()A.-1-i B.-1+I C.1-i D.1+i【回答】D知识点:数系的扩充与复数的引入题型:选择题...
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---UncleWangisinhospital.---Oh,really?I .I ...
问题详情:---UncleWangisinhospital.---Oh,really?I .I goandvisither.A. Didn’tknow;amgoingto B.hadn’tknown;would C.haven’tknown;will D.didn’...
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z=的共轭复数是 ( )A.+i B.-i C.1-i D.1+i
问题详情:z=的共轭复数是 ( )A.+i B.-i C.1-i D.1+i【回答】C知识点:数系的扩充与复数的引入题型:选择题...
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已知i为虚数单位,则i(1﹣i)等于( )A.1﹣iB.﹣1+i C.﹣1﹣i D.1+i
问题详情:已知i为虚数单位,则i(1﹣i)等于()A.1﹣iB.﹣1+i C.﹣1﹣i D.1+i【回答】D【考点】复数代数形式的乘除运算.【专题】数系的扩充和复数.【分析】直接利用复数的乘法运算法则求解即可.【解答】解:i为虚数单位,则i(1﹣i)=i﹣i•i=1+i.故...
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When I was a child, I watch TV whenever I wanted...
问题详情:When I was a child, I watch TV whenever I wanted to. A. should B. could C. must...
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I'msorry,I
问题详情: I'msorry,I____yourname.A.haveforgottenB.forgotC.hadforgottenD.forgotten【回答】A知识点:动词时态题型:选择题...
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i是虚数单位,=( ).A.1+i B.-1+i C.1-i D.-1-i
问题详情:i是虚数单位,=().A.1+i B.-1+i C.1-i D.-1-i【回答】C知识点:数系的扩充与复数的引入题型:选择题...
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When I was young, I watch TV whenever I wanted ...
问题详情: When I was young, I watch TV whenever I wanted to. A. should B. could C. must D. need【回答】B知识点:虚拟语气与情态动词题型:选...