This paper approaches operational requirement, typical pump types, structure difference and service performance of circulation pumps which are the key equipment in vacuum salt making.

本文探讨了真空制盐行业中关键设备循环泵的使用要求，常用的循环泵类型及其结构差异，使用性能，比较其优劣，为循环泵的选型提供参考。

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Light, sweet crudes are cheaper to pump, transport, and distill and produce more gasoline per barrel than other types of crudes so it generally goes for more dollars per barrel than others.

FORBES: British Government Faces Up To Peak Oil