... pellet rock 球粒岩 pellet sand 砂级球粒钙质沉积 pellet 小球 ...
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The main objective of this paper is to introduce the study made on a new type dual media namely the fibre-pellet-sand aed.
介绍一种新开发的滤料，纤维球——砂双层滤料的试验概况。
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