随着掺钨量的增加，其一次颗粒的平均粒度显著变小。
With the increase of doped tungsten, the average particle size of its primary grain gets smaller.
分别研究了一次颗粒尺寸、烧结时间对于二次造粒的影响。
The influence of the primary particle's size and the sintering time on the secondary particle was investigated.
以沉降炉作为燃烧设备来研究不同粒径煤粉燃烧后形成的一次颗粒物的特性。
A sedimentation furnace was employed as a combustion device to study the characteristics of primary particulate matter formed after the burning of pulverized coal of different particulate diameters.
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