次级产物
参考答案:
除了糖类、脂肪、核酸和蛋白质等基本有机物之外,植物体中还有许多其他有机物,如萜类、酚类、生物碱等,它们是由糖类等有机物代谢衍生出来的物质就叫次级产物。
—Are you free after school?
—Sorry.I've planned to treat a friend of mine to dinner ________ for his help.[ ]
A. in addition
B. in turn
C. in return
D. in total
脐带消毒方法正确的是()
A.用无菌纱布包裹
B.用酒精消毒脐带结痂处
C.脐带未落时无分泌物不必消毒
D.用酒精环形消毒脐带根部
E.用生理盐水消毒脐带