Draft Drive up型深
draft prepare draw up起草
natural draft up firing自然通风式垂直燃烧
double draft fluff block up二次拉丝机
up draft上抽
up draft brick kiln上向通风砖窖
up draft gasifier上吸式气化炉
up draft carburettor上吸式汽化器
up draft barn气流上升式燃煤烤房
draw up draft work out初步制订