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【简答题】
磁力线的特征:1)磁场的强弱可用磁感线的()表示,磁感线()的地方磁场强;()的地方磁场弱。2)在磁铁外部,磁感线从()极到()极;在磁铁内部,磁感线从()极到()极。磁感线是()的曲线。3)磁感线不()。
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中国中山站濒临太平洋
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南极大陆周围海上的冰山，是人类待开发的水资源
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【单选题】?Read the article below about. ?Choose the best sentence to fill in each of the gaps. ?For each gap 8-12, mark on letter (A-G) on your Answer Sheet. ?Do not use any letter more than once. The Steady P...
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D.
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E.
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F.
It needs emphasizing that all APEC members are in favour of regional free trade but all de not favour set time-schedules and their enforcement.
G.
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International arrival
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