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1. 一個单摆在质量为[m1]、半径为[R1]的星球上做周期为[T1]的简谐运动，在质量为[m2]、半径为[R2]的星球上做周期为[T2]的简谐运动，则[T1]∶[T2]等于（ ）
A. [R1R2m2m1] B. [m2m1R1R2]
C. [R1R2m1m2] D. [m1m2R1R2]
A. [R1R2m2m1] B. [m2m1R1R2]
C. [R1R2m1m2] D. [m1m2R1R2]