Gr:guaranteed reagent(优级纯试剂) ar:analytial reagent(分析纯试剂) cp:chemical pure(化学纯试剂) lr:laboratory reagent(实验试剂) 优级纯(gr,绿标签):主成分含量很高、纯度很高,适用于精确分析和研究工作,有的可作为基准物质。 分析纯(ar,红标签):主成分含量很高、纯度较高,干扰杂质. Guarantee 和 warranty 有什么区别二者区别在于具体意思,用法的不同。1、guarantee通常承诺退款,类似质保,而warranty通常只负责修理,类似保修。2、guarantee通常没有时限,与质量有关,如lifetime guarantee(寿 Sth =guarantee sth to sb.
向某人保证某事如:the boss guaranteed his workers t Recently it had begun experimenting with a household robot. Guarantee有哪些用法guarantee to do sth 保证会做某事如:i guarantee to pay off his debts.