选择题:偶遇抽样、判断抽样、定额抽样和滚雪球抽样都属于( )的范畴。

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偶遇抽样、判断抽样、定额抽样和滚雪球抽样都属于( )的范畴。

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将一个阻值是4Ω的电热器放进质量是0.5kg的冷水中,通过电热器的电流是5A,且电热器放出的热量全部被水吸收,则7min可使水温升高多少摄氏度?

将一个阻值是4Ω的电热器放进质量是0.5kg的冷水中,通过电热器的电流是5A,且电热器放出的热量全部被水吸收,则7min可使水温升高多少摄氏度?

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