This standard solution was accurately prepared in super-clean laboratory with m-nitrotoluene (99%) and sub-packed in 5ml ampoules.

本标准溶液以纯度为99%间硝基甲苯在超净实验室中准确配制并分装于5毫升安瓿中。

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This standard solution was accurately prepared in super-clean laboratory with o-nitrotoluene (99.9%) and sub-packed in 2ml ampoules.

本标准溶液以纯度为99.9%邻硝基甲苯在超净实验室中准确配制并分装于2毫升安瓿中。

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In this paper, a singular nonlinear elliptic boundary value problem which is very important in applied science and pure theory was discussed by the method of perturbation, sub-and super-solution.

本文利用摄动方法和上下解方法，讨论了一类奇异非线性椭圆边值问题，它具有很好的应用背景和理论意义。

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