镀锌六角螺栓螺帽
galvanized mild steel hexagonal bolt and nut
生成及演化
formation and evolvement histories
生长状况及生理功能
Growth and physiological function
生长因子及受体
Growth factors and receptors
生长习性及用途
characteristics of growth and uses
生长及组织发育
growth and histological development
生长及屠宰性能
growth and slaughter performance
生长及光合特性
growing and photosynthesis characters
生长及材性
growth and lignum characteristic