对零售药店处方的要求是( )
A.必须留存二年以上备查
B.必须留存三年以上备查
C.必须留存一年以上备查
D.必须留存四年以上备查
E.必须留存五年以上备查
参考答案:A
In the ______ Approach, class time is devoted primarily to providing input for acquisition; the teacher speaks only the target language, students may use either L1, or L2 ; errors not corrected.
紫外-可见分光光度法测定的波长范围是()
A.200~400nm
B.400~760nm
C.200~760nm
D.2.5-25μm
E.760~2500nm