It has been proved that normalized total gravity gradient method can be effectively used to ascertain the existence and exact location of single (or several) nonuniform density body.
重力归一化总梯度法用于研究单个或为数不多的密度不均匀体的分布和位置，已被证明是有效的。
Gravity separation is achieved by utilizing the difference of density between the mineral particles and the gangue particles, and their different sinking speeds in water or some other medium.
重选是利用矿粒与脉石的比重差别及其在水中或其他介质中不同的沉降速度进行的。
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