能直接用重氮化法测定含量的是( )
A.二苯胺B.苯乙酰胺C.苯甲胺D.硝基苯E.苯胺
参考答案:E
What do you know about the woman [A] She has missed the match. [B] She likes to watch football match very much. [C] She doesn’t care about it.
()混合式通风是将压入与抽出式相结合的通风方式。