roots central vacuum cleaning system 罗茨中央真空吸尘系统
Tube Web obstruction property of Roots central vacuum cleaning system is analyzed with fluid mechanics and industry ventilate principle.
应用流体力学和工业通风原理，分析了罗茨中央真空吸尘系统的管网阻力特性；
Based on the relative standard and a concrete project, gives an introduction for the use, design, and operation of a central vacuum cleaning system.
结合工程实例及其相关标准，介绍和分析中央真空清洁系统的用途、设计及使用。
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