聚羟基乙酸的经典制备方法主要有两种:直接缩合聚合法和乙交酯开环聚合法. There are two means available for the preparation of PGA - synthesis polymerization and ring - opening polymerization.
His documentary sources are demonstrably wrong.他的文献材料的来源确实是错误的.In fact, it is " demonstrably not a true stealth aircraft . "事实上他基本上不是一种真正的隐形 战机.None of the explanations offered is demonstrably correct—or demonstrably inc...
He often works by rule of thumb.他通常凭经验办事.As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.凭经验估计，一杯过滤咖啡约含80毫克咖啡因。A good rule of thumb is that a broker must generate sales of ten times his salary ...
The arrangement presumes that both lenders and borrowers are rational.这一协议假定借贷双方都是在神志清楚的状态下签订的。Financial institutions act as intermediaries between lenders and borrowers.金融机构充当贷方和借方的中间人。Lenders rely on the misplaced loya...