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精英家教網 > 初中英語 > 題目詳情
Frank is very lonely, he has few friends, ______?
A. does he               B. doesn’t he                   C. is he
A解析:
應先把820億元整理為用元表示的數,科學記數法的一般形式為:a×10n,在本題中a為8.2,10的指數為整數數位減1.820億="82" 000 000 000=8.2×1010
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