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求“双线摆”的振动周期,由于涉及到等效摆长和等效重力加速度的计算,同学们感到很难.笔者研究出一个有用的结论.用这个推论求“双线
To find the vibration cycle of the ”two-wire pendulum,“ the students felt very difficult because of the calculation of the equivalent pendulum length and the equivalent gravitational acceleration. The author studied a useful conclusion. Using this inference to find the ”double line"