第二管被设计成用于输送氧气的拉伐尔喷嘴形状并且它包围着用于输送固体物质或粉尘的第一中心管。
A second tube is configured as a Laval nozzle for the delivery of oxygen and encloses a first central tube for the delivery of solid substances or dust.
介绍了通过自制的喷嘴系统，向抬包底部喷吹氧气精炼工业硅的生产实践。
The practice is introduced for refining industrial grade silicon by oxygen injection to the bottom of two-man ladle through self-makings pray nozzle system.
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