提取原生苷常用的溶剂是()
A.酸性乙醇
B.乙醇
C.冷水
D.酸水
E.碱水
参考答案:B
--- This is the worst food I've ever tasted.
--- ____________.
A.Don’t say that.
B.You can say that again!
C.I’m sure about it.
D.Yes, they are.
下列物理量与所对应的单位不正确的是( )
A.n:mol
B.M:g•mol-1
C.NA:个
D.Vm:L•mol-1