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【单选题】
甲校有3600名学生,有5400名学生,丙校有1800名学生,为统计三校学生某方面的情况计划采用分层抽样法,抽取一个样本容量为90人的样本,这三校分别抽取学生(    )
A.
30人,30人,30人
B.
30人,50人,10人
C.
20人,30人,40人
D.
30人,45人,15人
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举一反三
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【单选题】【C4】
A.
conceded
B.
competed
C.
complied
D.
conferred
【单选题】Many questions also (arise) in the cloning of dinosaurs.
A.
平息
B.
(问题或困难)出现;由......引起;升起
C.
争论
【简答题】Language learning begins with listening. Children are greatlydifferent in the amount of listening they do before they start speaking, and later starters are often long listeners .Most children will “ ...
【简答题】Language learning begins with listening. Children are greatly different in the amount of listening they do before they start speaking, and later starters are often long listeners. Most children will “...
【单选题】最易遭受化学毒性代谢产物损伤的器官是
A.
B.
C.
D.
E.
【单选题】They conferred on the best way to ___ business.
A.
extend
B.
adjust
C.
expand
D.
adopt
【单选题】舞蹈人纹彩陶盆属于那种文化类型
A.
半山类型
B.
马厂类型
C.
马家窑类型
D.
庙底沟类型
【简答题】More and more colleges and universities are offering courses via distance learning. Distance learning has many benefits, but there are also drawbacks, and not every learner will be suited to this mode...
【简答题】利用圆弧滑动面法进行边坡稳定性验算时,确定圆心辅助线位置的近似方法有两种,即__________法和 36度线法。
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