【单选题】【消耗次数：1】
抽样调查与典型调查的主要区别是？
①
所研究的总体不同
②
调查对象不同
③
调查对象的代表性不同
④
调查单位的选取方式不同
参考答案：
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【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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