The new muffler device has simple structure,it has lesser effect on the resistance loss of chief ventil...
该消声装置构简单,对主要通风机的阻力损小,防尘、防潮及降噪效果明显,可广泛的应用煤矿主要通风机的消声降噪。
Recently, some experiments show the existence of prewhirl and reveal the asymmetrical scroll will affect the distribution of prewhirl.
近年来,已有的果显示,离心式通风机叶轮进口前的气流预旋确存在,而且其分布形式与人们通常的想象有很大不同。
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Ventilators are badly needed in developing countries.
发展中国家急机。
Is there something wrong with your air vents?
你家的机有问题吗?
They're spending money on protective gear, ventilators, overtime for people at hospitals.
要支付防护装备、机和医院工作人员的加班费。
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