瀚德乐公司最近推出的圆盘筛式供料机带有新机壳，这种新型圆盘筛式供料机可以防止原料干燥。其结构是：在圆盘的周围设有筛架，筛架上用......

The changes in the activity of amylase and amylase-isoenzyme and the degradation of starch and pigment of tobacco leaf d......