目的:研究解决蚊虫刺叮骚扰的问题,探讨植物源性驱避剂的实用性;方法:采用复配法制作复方樟脑凝胶驱避剂,按GB/T 17322,10-1998进......

We establish sufficient conditions of the multiplicity of real fixed points of two-parameter family . Moreover, the beha......