充填颗粒
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disperse grain pack 离散颗粒集合
pack-to-formation median grain size ratio 充填物与地层砂粒度中值比
·2,447,543篇论文数据，部分数据来源于NoteExpress
In this configuration, the HTP is passed over a catalyst pack to decompose it into steam and oxygen, but instead of igniting a fuel grain, this superhot gas is allowed simply to vent through the chamber nozzle.
BBC: Science & Environment
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