The heat-exchanger tube is a straight tube, a bent tube or a twisted tube.
所述的热交换管是直 管、弯管或盘管。
Correlations were conducted respectively according to straight tube, up return bend and down return bend.
依此按直管段，上回湾和下回弯分别作关联。
It is uncommon to apply white paint straight from the tube.
通常不使用直接从颜料管中取出的白色。
It is uncommon to apply white paint straight from the tube.
通常不使用直接从颜料管中取出的白色。
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