加重量于

The company take full advantage of its rich fly ash, steam, electricity and other resources, mainly the production of fly ash aerated concrete block series of new wall materials, products with light weight (equivalent to the red brick of the 1 / 3), noise insulation good, fire prevention, good processability, energy conservation (because of light weight thermal insulation of buildings can reduce the quality and reduce air-conditioning heating) and environmental protection advantages.

该公司充分利用其丰富的粉煤灰、蒸气、电等资源，主要生产粉煤灰加气混凝土砌块等系列新型墙材，产品具有重量轻（相当于红砖的1/3）、保温隔音性好、防火、可加工性好、节能（由于质轻保温可降低建筑物质量和减少空调暖气）环保等优点。

The process includes the following steps: dissolving bromine in halogenated hydrocarbon, dropping the bromine solution into reactant system comprising pentabromo toluene, halogenated hydrocarbon, free radical initiator and hydrogen peroxide at 50-65 deg.c, and heating to 60-78 deg.c for reflux reaction until the reactant system becomes transparent; filtering the resultant to obtain solid product, washing with carbon tetrachloride and water separately and vacuum drying to obtain pentabromo benzyl bromide.

具体步骤为：将五溴甲苯、卤代烃、自由基引发剂和过氧化氢组成的反应体系加入到三颈瓶中，将0.07～0.1mol的溴溶于50ml卤代烃配成溶液，在50-65℃温度下滴加到反应体系中，滴加时间为50-70分钟，然后升温至60-78℃温度下回流反应，至反应体系逐渐变透明，且不再产生气泡时，将所得产物过滤，得到固体产物，分别用CCl 4 和水洗涤，真空干燥，即得到五溴苄基溴；其中，五溴甲苯与溴的摩尔比为1∶0.7-1∶1.0，溴与过氧化氢的摩尔比为1∶1.0-1∶1.4，自由基引发剂加入量为五溴甲苯重量的1-10％，卤代烃的加入量为反应体系体积的40％-100％，所用溶剂可以直接进行下一批反应，不需要更换溶剂或蒸馏提纯。

Due to their simplicity in fabrication and excellent strength to weight ratio, stiffened steel plate are also widely used for construction of land-based structures such as box girder and plate girder bridges.

由于制作简单且有良好的强度重量比，加筋板也广泛应用于制造陆基结构物如箱梁和板梁桥等。

Next time I see you,I shall give you a black eye.

下次我看见你，我会打你一顿。

In this paper,design scheme of classification system of wood surface color is established.

提出了木质板材颜色分类的系统设计方案。