介绍了150SBD-12型离心式砂石泵轴端密封的结构原理和相应的技术措施。
The principle and technique of sealing of shaft end of the 1150SBD-12 centrifugal gravel pump are introduced.
数以百万吨的砂石从海底挖出，泵送至礁上形成新的陆地。
Millions of tonnes of rock and sand have been dredged up from the sea floor and pumped into the reef to form new land.
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