A iron bar is solid; a pipe is hollow.
铁条是实心的，管子是空心的。
Pipe produced from a solid billet that is heated and rotated under pressure.
由实心坯制成的管子，该实心坯在压力下加热和旋转。
The applicable formulae of pressure drop in the dilute flow for solid particle through a vertical pipe are developed.
文中提出了固体粒子稀相流垂直管内适用的压力损失计算式。
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