... difficulty and countermeasure 难点及对策 收藏 Difficulty Index 困难指数; 难度指数 收藏 difficulty of question 问题难度 收藏 ...
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item difficulty index 试题难度指数 ; 难度指数 ; 难易度指标
task difficulty index 任务难度指数
Weaving Difficulty Index 织造难度系数
operative difficulty index 操作难度
Difficulty index for apple 难易度指数
index of difficulty 难度指数
index difficulty weighting 指标难度赋权法
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