Local people think that logging has less influences on the forest because the stumps will geminate again and for some years the forest will be back 这种寒温山地硬叶常绿栎类林虽然在流域内分布面积较广，但是也容易为当地人利用。
2.
With the development of communication system capability , the channels of the dwdm system are geminated and the capability of every channel grows gradually . all of these require the dwdm source output has high precision and stability 随着通信系统容量的增加, dwdm系统的信道数成倍增加,每个信道容量也逐步提升,这些都大大增加了对dwdm光源输出精度和稳定性的要求。
3.
Since the preload and the friction moment of the geminate bearing are dominating factors affecting the performance of the navigation platform frame system , based on theoretical study on the control methods of bearing ' s preloads and frictional moment , the paper puts forward a method to control the preload of the twin bearings accurately . moreover , a multifunctional test apparatus of the navigation platform bearing is designed , and a lot of experiments of bearing ' s rigidity and friction moment and preload assessment are done 考虑到成对轴承预载荷和摩擦力矩是影响导航平台框架系统性能的主要因素，本论文对成对轴承预载荷及摩擦力矩控制技术进行了理论研究，提出了一种精确控制成对轴承预载荷的配对方法，设计了导航平台轴承多功能测试仪，并对导航平台轴承的刚度、摩擦力矩和预载荷评定技术进行了试验研究。
