不引起药物性聋的药物是（）。
A.抗生素
B.水杨酸盐
C.维生素类
D.利尿剂
E.抗肿瘤类
参考答案：C
He said_________ he would visit me and______ he would bring a special present to me.[ ]
A. \, \
B. that, \
C. \, that
D. that, what
有效杂音电压U和杂音计电压Uz有以下关系（）
A.U=Uz/K
B.Uz=U/K
C.U=KUz
D.Uz=KU
