说明：  It is well-known fact that batch processes are gaining wider ground in chemical industries. Compared with continuous processes the control of batch processes is more difficult because physical and chemical properties of the contents, such as heat capacity, heat transfer coefficient and reaction rate vary from run to run and within runs.模糊控制
(It is well-known fact that batch processes are gaining wider ground in chemical industries. Compared with continuous processes the control of batch processes is more difficult because physical and chemical properties of the contents, such as heat capacity, heat transfer coefficient and reaction rate vary from run to run and within runs.)