In the balance design, even distributed mass is required, special slip ring is taken to get electric signal and fixed mount is used at balance rear end to eliminate vibration.
天平设计要保证质量分布均匀，采用特制滑环引出电信号，并且天平后端用支架支撑以减小振动。
The energy of the spring that even mass is distributed is studied.
对质量分布均匀的弹簧的能量进行了研究。
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