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某学校高一年段共有480名学生,为了调查高一学业的学业水平,计划用系统抽样的方法...
某学校高一年段共有480名学生,为了调查高一学业的学业水平,计划用系统抽样的方法抽取30名学生作为样本:将480名学生随机从1-480编号,按编号顺序平均分成30组(1-16号,17-32号,…,465-480号),若从第1组中用抽签的方法确定的号码为5,则第8组中被抽中学生的号码是( )
A.215
B.133
C.117
D.88
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某小组有3名男生和2名女生,从中任选2名同学去参加演讲比赛,事件“至少1名女生”与事件“全是男生”( )
A.是互斥事件,不是对立事件
B.是对立事件,不是互斥事件
C.既是互斥事件,也是对立事件
D.既不是互斥事件也不是对立事件
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已知
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,|
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|=2,|
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|=3,且3
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+2
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与λ
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-
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垂直,则实数λ的值为( )
A.
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B.1
C.
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D.
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函数y=sinx+cosx+2的最小值是( )
A.2-
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B.2+
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C.0
D.1
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角α满足条件sin2α>0,sinα+cosα<0,则α在( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限
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已知函数f(x)=(1+a)
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