已知A,B,C是半径为1的求O的球面上的三个点
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已知A,B,C是半径为1的求O的球面上的三个点，且AC⊥BC,AC=BC=1，则三棱锥O-ABC的体积为（ ）
A、
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北京考生：数学“难哭了”！专家：难度与去年保持一致
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2021年6月8日 am10:17
设函数f(x)的定义域为R，f(x+1)为奇函数，f(x+2)为偶函数，当x∈[1,2]时，f(x)=a????2+????.若f(0)+f
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