矿井通风系统按进风井与出风井的位置进行分类,下列()不属于矿井通风系统的类型。
A.中央式
B.两翼对角式
C.分区中央式
D.混合式
参考答案:C
If you were more _ to your mother, she would help you at that time. [ ]
A. friends
B. friendly
C. angry
HPLC测定地西泮注射液的含量
A.萘B.碱性β-萘酚试液C.氨制硝酸银试液D.溴化氰试液E.碘化钾淀粉试纸 `