Total sells TC SA's unit 来自 掌桥科研 喜欢 0 阅读量: 3 摘要: Exxaro Resources is to buy Total's South African coal unit, the fifth-largest producer in the country, to gain expanded reserves and rights at the main export harbour for the fuel. Exxaro will pay US$472 million for ...
鸡啄癖是鸡群内出现的鸡只自啄或互啄的一种现象,这种现象往往是由鸡的病理反应引起的应激行为.但由于鸡在群体中有效仿行为的习性,如不及时采取措施控制,这种恶习便会在鸡群间传播.由于互相啄食,往往造成创伤,甚至死亡.其中啄肛危害最大,给养殖户造成严重的经济损失.随着农业生态经济的发展,我县林下养殖业也随之...