在粘度大多数单级油的差异太大，温度之间的极端。
The difference in viscosities for most single-grade oil is too large between the extremes of temperature.
在简述了多级油与单级油的特点与区别后，指出了多级油选择与使用中应注意的事项。
This paper introduces the characteristics and differences of multi-grade oil and one-grade oil, the points for attention of selecting multi-grade oil are presented.
不需冷却的单级涡壳泵，用于处理矿物或合成热传导油。
Horizontal, single stage uncooled volute casing pumps for handling of mineral and synthetic heat transfer oils.
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