下呼吸道感染感染
lower respiratory tract infection
模型,易感-感染-移出
Susceptive-infective-removal model
易感－感染－易感模型
Susceptible-Infected-Susceptible SIS model
16种多环芳烃
polycyclic aromatic hydrocarbons PAHs
从发酵液中提取多种抗菌素的新技术
new technique for extracting antibiotics from fermented liquor