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In a class this past December, after I wrote some directions on the board for students about their ...
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高三下学期英语《》真题及答案
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—WhenisNationalPublicMemorialDay国家公祭日?—OnDecember1
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StudentVolunteersNeeded! OnSaturdayDecember
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从方框中选择恰当的句子补全对话有两句是多余的JaneHiMeimei!1.MeimeiTodayis
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–HowcanIimprovemystudyinthelastthirtydays?--______
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StudentVolunteersNeeded! OnSaturdayDecember
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Setting up the gym.
Cleaning up the gym.
Helping the performers.
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StudentVolunteersNeeded! OnSaturdayDecember
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MsSmithThisisLiHuamonitorofClassTwoSeniorThreeofXi
—Whattimedoyougethome?—At_______.
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the night before December 24
the night after December 25
the night of December 25
the night of December 24
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已知动圆O1过定点F﹣且与圆O2x2+y2﹣2﹣13=0相切记动圆圆心O1的轨迹为曲线C. 1求C的方程 2设A20B01P为C上一点P不在坐标轴上直线PA与y轴交于点M直线PB与x轴交于点N求证|AN|•|BM|为定值.
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2019年是扶贫的关键年作为产业扶贫的电商扶贫将会迎来更多的政策或扶持.京东阿里拼多多抖音苏宁等互联网公司都纷纷加入电商扶贫.城乡各地区都展开农村电商培训如对电商团队物流企业返乡创业群体普通农户等进行培训.某部门组织AB两个调查小组在开展电商培训之前先进行问卷调查从获取的有效问卷中针对25至55岁的人群接比例随机抽取400份进行数据统计具体情况如下表 Ⅰ先用分层抽样的方法从400人中按“年龄是否达到45岁”抽出一个容量为80的样本将“年龄达到45岁”的被抽个体分配到“参加电商培训”和“不参加电商培训”中去. 1这80人中“年龄达到45岁且参加电商培训”的人数 2调查组从所抽取的“年龄达到45岁且参加电商培训”的人员中抽取3人安排进入抖音公司参观学习求这3人恰好是A组的人数X的分布列和数学期望 Ⅱ从统计数据可直观得出“参加电商培训与年龄记作m岁有关”的结论.请列出2×2列联表用独立性检验的方法通过比较K2的观测值的大小判断年龄取35岁还是45岁时犯错误的概率哪一个更小 参考公式其中n=a+b+c+d
设集合A={124}B={34}则集合A∩B=
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