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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。

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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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FPSS, FPSU, FPT, FPU, FPV, FPW, FPY, FQDN, fr, FRA,

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VOA常速英语_非洲

Ventilators are badly needed in developing countries.

发展中国家急

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摩登家庭第七季_Modern Family-Season07

Is there something wrong with your air vents?

你家的有问题吗?

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NPR音讯 2020年4月合

They're spending money on protective gear, ventilators, overtime for people at hospitals.

要支付防护装备、和医院工作人员的加班费。

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