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；
Outfitting the apartment building with a solar thermal system of ten vacuum-tube collectors for the central domestic water supply is an additional energy efficiency measure.
舾装公寓大楼和一个太阳能热系统的真空管集热器十中央家庭供水是一个额外的能量效率的措施。
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