根据题意得,a-2=0,b-12=0,
解得a=2,b=12,
所以,a-b=2-12=32.
故答案为:32.
外阴 * * 假丝酵母菌病的白带特点是()。
A.豆渣样
B.血性白带
C.脓性白带
D.泡沫状
E.黄色水样
58. Sometimes, the entrance tickets are _______ free of charge from the university.
A.available
B.valuable
C.imaginable
D.Comfortable