甲型H1N1流感病毒的直径大约是0.000 000 081米,用科学记数法可表示

甲型H1N1流感病毒的直径大约是0.000 000 081米,用科学记数法可表示为(  )

A8.1×1     B8.1×1米    C81×1米    D0.81×1

答案

B

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