单项选择题
A.9%~15% B.15%~25% C.35%~45% D.45%~55%
A.4:1(4份牛奶加1份水) B.3:1(3份牛奶加1份水) C.2:1(2份牛奶加1份水) D.1:1(1份牛奶加1份水)
A.炼乳 B.酸奶 C.配方奶 D.鲜牛奶