To establish the early warning mechanism for water environment, enhance the capability that is on guard the water disaster of Dongjiang River's source.
建立水环境预警系统，提高防范东江源水环境灾害的能力。
It is indicated that the water-holding capability of fine quartz is higher than of the coarse quartz in the same environment condition.
结果表明在相同的环境条件下，细石英砂比粗石英砂具有更大的持水能力。
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