题目内容

采用水解反应鉴别青霉素V钾时,所用试剂

A. 青霉素酶
B. 醋酸盐缓冲液(PH4.6)
C. 咪唑溶液
D. 正十四烷的正己烷溶液
E. 茚三酮溶液

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汞量法测定青霉素钠时,所用试剂

A. 青霉素酶
B. 醋酸盐缓冲液(PH4.6)
C. 咪唑溶液
D. 正十四烷的正己烷溶液
E. 茚三酮溶液

In Hallidays view, the______function of language is realized as the transitivity system in

A. ideational
B. interpersonal
C. textual
D. social

Consider the following words and finish two tasks: For each word, determine whether it is

Each of the following words can be either a noun or a verb. record outline report journey

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