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【单选题】
某班级有 50 名学生,其中有 30 名男生和 20 名女生,随机询问了该班五名男生和五名女生在某次数学测验中的成绩,五名男生的成绩分别为 116 , 124 , 118 , 122 , 120 ,五名女生的成绩分别为 118 , 123 , 123 , 118 , 123 ,下列说法一定正确的是( )A.
这种抽样方法是一种分层抽样
B.
这种抽样方法是一种系统抽样
C.
这五名男生成绩的方差大于这五名女生成绩的方差
D.
该班级男生成绩的平均数小于该班女生成绩的平均数
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【单选题】--David has been away for more than 25 days． --I miss him very much．You know，25 days short．
A.
is
B.
isn’t
C.
are
D.
aren’t
【单选题】David has been away for more than 25 days.-I miss him very much.You know ,25 days _______short.
A.
isn't
B.
is
C.
are
D.
aren't
【单选题】— David has been away for more than 25 days . — I miss him very much . You know, 25 days short .
A.
is
B.
isn ’ t
C.
are
D.
aren ’ t
【单选题】— David has been away for more than 25 days. --I miss him very much.You know , 25 days ______ short.
A.
is
B.
B .isn ' t
C.
C are
D.
aren ' t
【单选题】David has been away for more than days.I miss him very much.You know ,25 days _______short.
A.
is
B.
isn't
C.
are
D.
aren't
【单选题】— David has been away for more than 25 days. --I miss him very much.You know , 25 days ______ short.
A.
is
B.
isn’ t
C.
C are
D.
aren’ t
【单选题】下列不属于流程再造的基本原则的是()
A.
围绕任务，而不是结果来组织。
B.
让需要这个流程产出的人执行该流程
C.
把信息处理工作包容到产生该信息的实际工作中
D.
一次就在信息源头把信息捕捉住
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