以下为句子列表：
英文: With the tracing particles,the sinking velocity of middle and higher density particles that pass through the lower density coal particles in jig bed for different jigging air circle were measured.The results showed that the air cycle with a long inlet per
中文: 运用彩色人工颗粒，对不同跳汰周期下中、高密度颗粒在低密度煤炭床层中的沉降速度进行了示踪研究，确认长进气期周期有利于中、高密度颗粒与低密度煤炭颗粒的分离。
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