在当前制度和市场环境下，我国民营上市公司的第二类代理问题比较严重。
Under the current institutional and market condition, the second agency problem is very serious in Chinese listed private-controlled companies.
本文阐述了生态平衡下，森林采伐如何进行。森林资源划分为三大类：第一类是环境资源林；第二类是工业人工林；
Under protecting ecological balance, the authors of this paper present that forest resources are divided into three parts: environment forest, industrial forest and mountain conprehensive forest.
由于受人体运动特性的影响，第二类人体振动环境的频率很低。
When frequency of vibration source is low, vibration environment is equal to first category body vibration environment.
由于受人体运动特性的影响，第二类人体振动环境的频率很低。
When frequency of vibration source is low, vibration environment is equal to first category body vibration environment.
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