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【单选题】
下面有关偶然误差的表述中正确的是( )A.
、小误差出现的概率相同;②正、负误差出现的概率相同;③大误差出现的概率小,小误差出现的概率大;④正误差出现的概率小,负误差出现的概率大。①②
B.
①③
C.
②③
D.
②④
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【简答题】思想初步形成于
【简答题】I have to delay _________ the letter.
【简答题】A few days ago, I got a letter from a student. In his letter, he told me, “I have this friend at school. She’s one of my good friends but lately she has been __ _36_ _ strange. When I talked to her th...
【单选题】I quickly answered your letter, for, if I delayed, you _________ I was not concerned about your difficulties. [
A.
] had thought [
B.
] thought [ C] would think [ D] were thinking
【简答题】I'll write back as soon as I __________your letter.
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