氧乙炔的

This paper expounds the oxyacetylene flare overlaying welding technology of tungsten carbide rod made to be metal matrix carbide ceramal compound overlaying welding layers.

介绍碳化钨条氧乙炔火焰堆焊制备金属基碳化物陶瓷复合耐磨堆焊层的工艺方法，结合碳化钨条氧乙炔火焰堆焊工艺过程、堆焊层性能特点、泥沙磨损实验结果及显微组织形貌，分析讨论了热源性质对堆焊层性能的影响以及复合耐磨堆焊层的抗泥沙磨损特性。

The remaining 20%of the acetylene production is principally used for oxyacetylene cutting, heat treating, and welding.

乙炔生产的剩余20%主要用于氧乙炔切割、热处理和焊接。〖产品安全

The remaining 20%of the acetylene production is principally used for oxyacetylene

乙炔生产的剩余20%主要用于氧乙炔切割、热处

The most common is the oxyacetylene welding, namely the use of acetylene and oxygen produced during combustion of oxyacetylene flame to melt the workpiece and the wire heating, condensation formed after the seam welding method.

最常用的是氧乙炔焊，即利用乙炔和氧混合燃烧时所产生氧乙炔焰，来加热熔化工件与焊丝，冷凝后形成焊缝的焊接的方法。

Syntheses of PPVs derivatives with alkoxyl as side-chain by the method of dehalogenating condensation reaction Those PPV derivatives, named poly (2-methoxy-5-alkoxyl) phenylene vinylene,containing alkoxyl on benzene ring, were placed on emphasis in this paper.

一。通过强碱诱导的去卤缩合法合成支链含不同烷氧基的PPV衍生物本文首先重点研究了支链中含不同链长烷氧取代基的PPV衍生物：聚(2-甲氧基-5-烷氧基)对苯乙炔。

The present paper describes the effect of the ethine absorbed and solved in the liquid oxygen on the liquid oxygen in the main condenser-evaporator since revamp of the air separation unit with liquid air and liquid oxygen absorber into the air separation unit with molecular absorber as well as measurement of the ethine content.

阐述空分设备由一般的液态空气吸附器和液态氧吸附器改造为分子筛吸附器后，吸附溶解在液态氧中的乙炔对主冷液态氧的影响程度及乙炔含量的检测。

The artical puts forward the corresponding technical transform of the Oxygen-acetylene cutting and welding equipment-with liquid gas instead of acetylene.

本文针对我国火焰加工的能源结构状况，提出对氧—乙炔切割与焊接设备进行相应的技术改造，实现用液化石油气代替乙炔。

The remaining 20%of the acetylene production is principally used for oxyacetylene cutting, heat treating, and welding.

乙炔生产的剩余20%主要用于氧乙炔切割、热处理和焊接。蒸人的暑热使他头晕目眩。

The remaining 20%of the acetylene production is principally used for oxyacetylene cutting, heat treating, and welding.

乙炔生产的剩余20%主要用于氧乙炔切割、热处理和焊接。属类：-〖产品安全

It combines the Self-propagation High-temperature Synthesis and oxygen-acetylene flame spraying, and consists of synthesizing cermet-based material and depositing it simultaneously.

它将涂层材料的合成与沉积合二为一，为制备金属陶瓷涂层提供了一条新的途径，同时将氧乙炔火焰喷涂材料延伸至金属陶瓷领域，拓宽了氧乙炔火焰喷涂技术的应用范围。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。