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当前学科：饭店服务质量管理
题目：
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在ABC分析法中，B类问题的特点是项目数量一般，发生次数也相对少一点，约占投诉总数的（）。
A . 10％～15％
B . 10％～20％
C . 20％～25％
D . 20％～30％
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