... back boiler 家用热水炉[装在壁炉背后,不占可见空间的小锅炉];备用煮水器 back-draft 反向气流 backfill 回填 ...
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... 排风道 exhaust airways 反向气流 inverted draught 入孔门 access door/ manhole door ...
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... back drain (堤或墙的) 背面排水 back draught 反向气流 back drilling attachment 反钻附件 ...
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反向流/逆流曝气系统 counter current aeration system
脉冲式、反向射流式除尘器能够比振荡式、反向气流式的过滤速度获得高些。
The pulse type and reverse jet dust collector can obtain higher filtering speed than the oscillating and reverse air flow.
在春夏两季气流扭转方向后，或许可以指望反向的风缓解冬季的阴霾。
After the air stream reverses course in the spring and summer, reciprocal winds could be counted on to bring some respite from the winter haze.
编辑本段特点单向阀是气流只能一个方向流动而不能反向流动的方向控制阀。
Editor this section features Check is air flows in one direction and not only reverse flow direction control valves.
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