选择题:如图, 在四棱锥 P﹣ ABCD 中, 底面 ABCD 是平行四边形, ∠BCD=135° ,侧面 PAB⊥底面 ABCD, ∠BAP=90° , AB=AC=

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如图, 在四棱锥 P﹣ ABCD 中, 底面 ABCD 是平行四边形, ∠BCD=135° ,侧面 PAB⊥底面 ABCD, ∠BAP=90° , AB=AC=PA=2, E, F分别为 BC, AD 的中点,点 M在线段 PD 上.

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某地高中年级学生某次身体素质体能测试的原始成绩采用百分制, 已知这些学生的原始成绩均分布[50, 100]内, 发布成绩使用等级制, 各等级划分标准见下表, 并规定: A, B, C 三级为合格, D

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