具有抗组胺H1受体的药物是（）
A.哌唑嗪
B.氯丙嗪
C.异丙嗪
D.丙米嗪
E.氟桂利嗪
参考答案：C
_____ was it _____ prevented him from attending the meeting? [ ]
A. What; what
B. What; that
C. It; what
D. That; that
ETL机组出口活套固定辊有（）个
A.10
B.11
C.12
D.13
