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。
And under the condition of propagating against weak wind, most of medium-scale gravity waves can reach observation height.
而在弱逆风作用下，大部分中尺度范围重力波都能够传播到观测高度。
Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering.
浆砌石重力坝由于其经济性和安全性，在很多中小型工程中被采用。
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