某市去年完成了城市绿化面积eqIdfecc38b64d0d411c9053a3e7c01d775d.将“8210000”用科学记数法可表示(     )
A. eqId87b03fe0552943188a8aa2fd4937edfb               B. eqId227a6f0945d44fd98cadb8daabb8d070              C. eqId943ac29a5ca44bb79596b51203a10fef           D. eqId2af16fcab36e448ea08e346b4ca59e01
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