The improvement of Multiple centrifugal pump sealing protection ring for ammonia production was introduced.

介绍了合成氨生产中多级离心式打水泵密封保护环的改造.

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The introduces the characteristics of the marine submersible series multiple centrifugal pump developed by the authors.

主要介绍作者研制的船用潜水式串并联离心泵的特点及其结构设计和水力设计中应考虑的问题.

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