The new muffler device has simple structure,it has lesser effect on the resistance loss of chief ventil...
该消声装置结构简单,对主要通风机阻力损失影响,、潮及降噪效果明显,可广泛应用煤矿主要通风机消声降噪。
Recently, some experiments show the existence of prewhirl and reveal the asymmetrical scroll will affect the distribution of prewhirl.
近年来,有实验结果显示,离心式通风机叶轮进口前气流预旋确实存在,而且其分布形式与人们通常想象有很大不同。
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Ventilators are badly needed in developing countries.
发展中国家急需风。
Is there something wrong with your air vents?
你家的风有问题吗?
They're spending money on protective gear, ventilators, overtime for people at hospitals.
他们要支付防护装备、风院工作人员的加班费。
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