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.
确定了五个级次的剩余油分布模式，包括微观级、单井单层级、井间单层级、层间级和平面级。
It confirms five classes of remains distributing mode, including micro-class, single-well and singe-layer class, inter-well and single-layer class, inter-layer class and plane class.
确定了五个级次的剩余油分布模式，包括微观级、单井单层级、井间单层级、层间级和平面级。
It confirms five classes of remains distributing mode, including micro-class, single-well and singe-layer class, inter-well and single-layer class, inter-layer class and plane class.
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