关于acr的文学精选
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—Wasshebadlyhurt?—Yes,eachtimeshemovedherleg,she acr...
问题详情: —Wasshebadlyhurt?—Yes,eachtimeshemovedherleg,sheacry. A.brokeout B.tookout C.letout D.keptout【回答】C知识点:词组短语题型:选择题...
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A young man, while traveling through a desert, came acr...
问题详情:A young man, while traveling through a desert, came across a spring of clear water. 33water was sweet. He filled his leather container so that he could bring some ...
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已知三棱锥S―ABC的各顶点都在一个半径为r的球面上,球心O在AB上,SO⊥底面ABC,AC=r。则球的体积与...
问题详情:已知三棱锥S―ABC的各顶点都在一个半径为r的球面上,球心O在AB上,SO⊥底面ABC,AC=r。则球的体积与三棱锥体积之比是 。【回答】解析:由题意,知 OA=OB=OS=r,△ABC在大圆上,线段AB是球的直径,也...