面积微元dxdy本来就等于rdrdt,所以只要把被积函数f(x,y)转化为f(rsint,rcost)，就可以在指定面积上就可以积分了。
Dhs, Chris Miles
A high-level overview of DJ BRIC Russia 5 DR Index Total Return (B5RDRDT) stock. Stay up to date on the latest stock price, chart, news, analysis, fundamentals, trading and investment tools.
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Exhibit R-2,RDT&E budget item justification.http://www.dtic.mil/descripti-vesum/Y2010/AirForce/0303140F.pdf. 2009Navy: EXHIBIT R-2, RDT&E Budget Item Justification, 0603851M Non-Lethal Warfare Demonstration and Validation, February 2007. In: http://www.dtic.mil/ descriptivesum/Y2008/Navy...
Through COSY (Correlation spectroscopy), many J-coupling interactions could be observed which are being used in elucidating the structure of 2-bromo-1-methyl-1H-pyrrole-3-carbaldehyde.Prashant DwivediKartikeya DwivediManish Mitra
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