up-draft carburettor是什么意思

用法例句

The traditional exhaust hood and canopy hood with attached air curtain have different principles.

传统排风罩和气幕上吸罩是两种工作原理不同的局部排风设备。

5mm and 2mm have been prepared by copper mold upper suction casting method for x=2 and x=4 alloys,respectively.

本文用铜模上吸铸法制备Fe78-2xCrxMoxSn2 P10 Si4B4C2 (x =2、4 ,原子百分比 )块体非晶合金系列 ,制备出直径达 2 5mm的Fe74Cr2 Mo2 Sn2 P10 Si4B4C2 非晶合金棒材和直径达 2mm的Fe70 Cr4Mo4Sn2 P10 Si4B4C2 非晶合金棒材。

The complexation reaction of ascorbic acid with Fe(Ⅱ) under various conditions has been investigated by TLC in-situ absorption spectrometry, and two different structures for the chelates were investigated.

本文利用薄层色谱板上吸收光谱研究了抗坏血酸与铁（Ⅱ）离子在不同pH值和不同配比溶液中络合反应情况，并对抗坏血酿-铁（Ⅱ）螯合物的结构进行了探讨。