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In stead of using butyl nitrite and absolute ethyl-ether as reagents,in an improved method,cupferron.

本文介绍了以乙酯代替丁酯,用氯苯代替水乙醚合成铜铁新工艺。

Learning German will stand her in good stead when she goes to work in the export department.

等她到出口部工作时候，学习德语会对她十分有用。

The analytical solutions for the stead state equations of four wave mixing with an arbitrary complex coupling constant are given without the undepleted pump approximation.

在泵浦非耗竭近似下，给出了复耦合系数为任意值时稳态四波混频耦合波方程组解析解。