皮皮学，免费搜题
登录
搜题
【单选题】
研究者拟从l00个学生名单中抽取20人作为样本进行相关研究，如果从第三位开始抽取，按照3、8、13、18、23……的形式连续抽取，直到抽满20人为止。这种取样方法是()A.
简单随机取样
B.
分层随机取样
C.
整体随机取样
D.
等距随机取样
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】--- What’s the matter? The young mother looks worried. --- Her little baby boy has_________ fever.
A.
/
B.
a
C.
the
【简答题】A baby born in India has been declared the world's seven billionth person by child rights group Plan International．Baby Nargis was born at 07：25 local time(01：55GMT)in Mall village in India's Uttar Pr...
【简答题】A baby born in India has been declared the world's seven billionth person by child rights group Plan International. Baby Nargis was born at 07:25 local time (01:55GMT) in Mall village in India's Uttar...
【简答题】阅读理解。 A baby born in India has been declared the world's seven billionth person by child rights group Plan International. Baby Nargis was born at 07:25 local time(01:55GMT)in Mall village in India's U...
【简答题】腹胀或痛，腹部时有条索状物聚起，按之胀痛更甚，便秘，纳呆，舌苔腻，脉弦滑。证属（ ）
【简答题】电子计算机经历了 4 个发展阶段。 1 第一代( 1946-1958 年)是 _______ 计算机。这一代计算机的逻辑元件采用 ________ ,并使用 ________ 编程。 2 第二代( 1959-19 年)是 _________ 计算机。对一代计算机的逻辑元件采用 ________ 。与此同时,出现了 __________ 语言。 3 第三代( 1965-1970 年)是 ____...
【单选题】Maria has to baby-sit. That’s______ she can't come with us.
A.
why
B.
ho
C.
when
D.
what
【简答题】发生噎食时老人会有哪些表现？
相关题目：