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。
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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