搅拌器相关的翻译？ bolts / set screws on the hub for attaching blades - drill the heads and use stainless steel tie wire thru the heads and around the shaft. also, have used 316 stainless steel weld filler wire, comes in 10# boxes 36” long pieces, on short notice 搅拌桨连接螺栓/螺丝-在head(上盖？)钻孔，并用不锈钢铁丝穿过head并缠绕shaft(轴？)。另外，采用316不锈钢焊丝穿入#10箱，36.。。。 后半句不完整，看不懂查看更多
三苯基磷系列物的性质如何? 以下是引用 gentleseven 在2008-2-27 23:00:00的发言： what do you mean (p＋进攻羟基), please do not use phases such as (elctrophile attacts nucleophile). indeed, the formation of very strong phosphine oxide double bond is the driving force of the reaction. in most cases, once pph3 and oxygen involved in a reaction o=pph3 would normally be formed as the product. " ＋进攻羟基" is how it wroks. please find the mechanisms of mistsunobu reaction and other reactions where pph3 involved as a reactant. actually if pph3 were that active, it will be much easier for organic chemists to handle many more reactions. [em07][em07][em07]查看更多
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