英语作文:预防H7N9禽流感
问题描述：
英语作文:预防H7N9禽流感
答
H7N9 is a subtype of avian flu.Influenza virus particles wax covered by the two type surface glycoprotein,a type of phytohemagglutinin (H),a type of neuraminidase (N),H was divided into 15 subtypes,N ...