A:用于快速繁殖优良品种的营养繁殖
B:用于快速繁殖优良品种的花药离体培养技术
C:用于快速繁殖优良品种的嫁接技术
D:用于快速繁殖优良品种的植物组织培养技术
I can swim, I can't swim very well.