In scientific disciplines, a student begins by studying general reference works such as text books.
在科学学科中，学生首先从研究通用的参考材料比如课本开始。
The choice and application of the general vacuum pump oil are described, a reference is given to the user, service workers, works and sales departments in the article.
介绍常用真空泵油的选择考虑和应用实例，供用户、有关厂商和维修人员参考。
The choice and application of the general vacuum pump oil are described, a reference is given to the user, service workers, works and sales departments in the article.
介绍常用真空泵油的选择考虑和应用实例，供用户、有关厂商和维修人员参考。
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