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【多选题】
下列关于我国天文学的描述,正确的有( )。A.
《春秋》中有中国历史上第一次有确切日期的日食记录
B.
《诗经》中保存了世界上关于哈雷彗星的最早记录
C.
唐代和尚僧一行在世界上第一次测量出地球子午线的长度
D.
东汉明了世界上第一台利用水力转动的浑天仪
E.
战国时期的《经》是世界上最早的天文学著作
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【单选题】H5N1 avian influenza, known commonly as bird flu, has killed at least 15 people across Asia and was confirmed in China on January 27. No human cases have been found in the mainland, but 13 of the coun...
A.
Wild birds.
B.
Wild animals.
C.
Home-raised birds.
D.
Home-raised animals.
【简答题】平均偏差和标准偏差是用来衡量分析结果的____,当平行测定次数n<20时,常用____偏差来表示。
【简答题】H5N1 avian influenza, commonly known as bird flu (流感), has killed at least 15 people across Asia and was proved in China on January 27. No human cases have been found in the mainland, but 13 of the c...
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