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【多选题】
由于变量有连续性变量和离散性变量两种，其组限的划分，有不同的要求（ ）。A.
划分连续性变量的组限时，相邻组的组限必须间断；
B.
划分连续性变量的组限时，相邻组的组限必须重叠
C.
划分离散性变量的组限时，相邻组的组限必须间断
D.
划分离散性变量的组限时，相邻组的组限不必间断
E.
划分离散性变量的组限时，相邻组的组限不必重叠
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举一反三
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A.
special fees that Internet users were charged
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Federal Trade Commission
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Commercial Alert
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【简答题】pulse width
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