调查是�学探究常用的方法之一有关调查的叙述正确的是 A.调查时要有明确的目的和对象b.所有的调查都要选取样本c.在调查过程中不必作记录d Template


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tomski调查是�学探究常用的方法之一有关调查的叙述正确的是 a.调查时要有明确的目的和对象b.所有的调查都要选取样本c.在调查过程中不必作记录d coloring