The new toy is ___________ you.[ ]
A. to
B. on
C. for
D. at
答案:C
已知0.1 mol/L的醋酸溶液中存在电离平衡:CH3COOHCH3COO-+H+,要使溶液中
c(H+)/c(CH3COOH)值增大,可以采取的措施是[ ]
A.加少量烧碱溶液
B.升高温度
C.加少量冰醋酸
D.加水
简述发酵剂制备的操作步骤。