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.

該公司充分利用其豐富的粉煤灰狂野殴美激情性XXXX、蒸氣肥熟女视频一区二区三区、電等資源91看片淫黄大片，主要生產(chǎn)粉煤灰加氣混凝土砌塊等系列新型墻材色综合久久88色综合久久天天，產(chǎn)品具有重量輕（相當(dāng)于紅磚的1/3）十八岁禁看的网站、保溫隔音性好日高清无码视频、防火、可加工性好、節(jié)能（由于質(zhì)輕保溫可降低建筑物質(zhì)量和減少空調(diào)暖氣）環(huán)保等優(yōu)點(diǎn)精品国产91亚洲。

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.

具體步驟為：將五溴甲苯www.色色色五月天、鹵代烴、自由基引發(fā)劑和過(guò)氧化氫組成的反應(yīng)體系加入到三頸瓶中日韩精品第十八页在线播放免费观看，將0.07～0.1mol的溴溶于50ml鹵代烴配成溶液久久久久精品无码AⅤ，在50-65℃溫度下滴加到反應(yīng)體系中，滴加時(shí)間為50-70分鐘精品二区视频在线观看，然后升溫至60-78℃溫度下回流反應(yīng)欧美亚洲国产一区二区三区VA，至反應(yīng)體系逐漸變透明，且不再產(chǎn)生氣泡時(shí)性生活口交黄片，將所得產(chǎn)物過(guò)濾一级一级一级一级一级片，得到固體產(chǎn)物，分別用CCl 4 和水洗滌欧美激情精品视频一区二区，真空干燥国产自产拍一区精品，即得到五溴芐基溴；其中亚洲VS天堂，五溴甲苯與溴的摩爾比為1∶0.7-1∶1.0黄色视频免费看高清版，溴與過(guò)氧化氫的摩爾比為1∶1.0-1∶1.4，自由基引發(fā)劑加入量為五溴甲苯重量的1-10％美女性爱一区二区在线，鹵代烴的加入量為反應(yīng)體系體積的40％-100％久草视频免费在线，所用溶劑可以直接進(jìn)行下一批反應(yīng)，不需要更換溶劑或蒸餾提純精品国产免费看。

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.

由于制作簡(jiǎn)單且有良好的強(qiáng)度重量比，加筋板也廣泛應(yīng)用于制造陸基結(jié)構(gòu)物如箱梁和板梁橋等国产在线你懂得。