()啤酒和()啤酒的蔗糖转化酶应呈阳性。
A.生啤酒
B.熟啤酒
C.鲜啤酒
D.桶装啤酒
参考答案:A, C
简述常用的德育方法。
Computers,mobile phones,and other digital home appliances are now inextricable parts of the structure of modern societies,made possible by the low cost of producing______.
A.Central Proeessmg Unit B.integrated circuitsC.Hard disk D.software integration