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【单选题】
压力理论计算主动土压力时,无粘性土的被动土压力系数Kp,其值为()A.
tan2(45°-φ/2)
B.
tan2(45°+φ/2)
C.
tan(45°-φ/2)
D.
tan(45°+φ/2)
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【简答题】y=sinx的最小正周期是
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