Cleaning fluid of reservoir accuracy of filtering system step by step to ensure that the lotion is clean.
清洗储液与逐级精度过滤系统，确保洗剂洁净。
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；
Cleaning fluid of reservoir and accuracy of filtering system step by step to ensure that the lotion is clean.
清洗储液与逐级精度过滤系统，确保洗剂洁净。
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