①渗透盐分,析出水分
②给腐乳必要的咸味
③防止毛霉继续生长和污染的杂菌繁殖.
A:①②
B:②③
C:①③
D:①②③
已知二次函数y=x-12-3,则此二次函数( )
My favourite book is _______ a teacher. ( )