本文讨论了时差法成品油超声波流量计的基本原理、优缺点等。
In this paper, the principle of transit-time differential method of ultrasonic flow measurement is introduced along with the discussion of its advantages and disadvantages.
对具有一定影响的模型的理论基础、应用范围及优缺点等进行了分析和比较；
The theoretical basis, application range as well as the advantages and disadvantages of the models which have strong influence are analyzed and compared with each other.
过渡性替代ODS有机溶剂清洗剂的组成、性能、应用场所、淘汰时限、优缺点等；
The components, physical characters, applications, cleaning performance, elimination time, advantages and disadvantages of transitional alternative ODS organic cleaning solvents were presented.
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