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共找到 350 与Dr 相关的结果,耗时8 ms
质点作平面曲线运动,运动方程的标量函数为x=x(t),y=y(t),位置矢量大小小|r|=√(x^2+y^2),则下面哪些结论是正确的?A质点的运动速度是dx/dtB质点的运动速率是|v|=d|r|/dtc|v|=|dr/dt|(主要是b为什么是错
数学
Math.sin(dr)*150其中的dr是什么意思,整句话怎么解释
数学
阅读理解In1954aturningpointinmedicalhistoryresultingfromappliedbionics(仿生学)wasthefirst“openheart”surgerydoneinMinneapolisMinnesodaby
Dr
.C.W
英语
nneapolis Min
英语翻译
Dr
.MartinLutherKing,Jr.(January15,1929–April4,1968)wasanAmericanpoliticalactivist,themostfamousleaderoftheAmericancivilrightsmovem
英语
civil rights
OnedayJuneGreenvisitedthefamilydoctor,EdwardSmith.
Dr
.Smithwasanoldmanwithalongbeard."What'stheproblem,June?"
Dr
.Smithaskedher."I'mveryw
英语
asked her."I'm
阅读理解OneeveninginNovember
Dr
.BerlinreceivedatelephonecallfromMrs.Green.“please
Dr
.BerlincometomyhouseIhad5000dollarsonmydeskandnowitisgon
其他
000 dollars on
短文填词,狠急狠急,帮帮忙Manypeoplewerewaitingf1thetrain.Somewerer2newspapers,andsomeweresayinggoodbyetotheirfriends.DR.Zhao,MrWuandMrLiuweretalki
其他
o,Mr Wu and Mr
Dr
.Yangworkedthreedaysago.[]A.inhospitalB.athospitalC.inahospitalD.atahospital
英语
大学英语1的试题1.Thatdressyouboughtyesterdayisagood.A.demolishB.purchaseC.variationD.pardon2.Beforetestingthismethodonpatients,
Dr
.Smithtestsf
英语
ients,Dr.Smith
求老师解答:"You'dbetternotri"You'dbetternotringmeupbetween9and10.Ianimportantmeetingthen",
Dr
.Leesaid.[]A.haveB.hadC.washavingD.willbehaving
英语
] A. have
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