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3 实验结果3．1 力学系统测重力加速度a．理论推导考虑位于液面上的一个质元，当其处于平衡时 Ncos =mg且Nsin =mw2x，如图 4所示．
3 Experimental Results 3.1 Mechanics System Gravity acceleration a. Theoretical derivation considers a mass element lying on the surface of the liquid, when it is in equilibrium Ncos = mg and Nsin = mw2x, as shown in Figure 4.