Ventilation: positive downdraft exhaust ventilation should be provided to maintain vapor concentration below TLV.

通风: 为了使气体聚集程度维持在阀极限值之下,应提供通畅的向下棋流排气通风设施.

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Beijing Cherokee engine uses Cart YFA carburetor which is single barrel, downdraft carburetor with triple venturi.

北京切诺基发动机采用卡特YFA单腔 、 下吸式、三重喉管化油器.

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When you have an economic downdraft like this, that same flexibility can be a severe detriment.

当你遭遇这种规模的经济衰退时, 同样的弹性可能就会非常不利.

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