最容易引起再生障碍性贫血的药物是()
A.氯霉素
B.磺胺嘧啶
C.环磷酰胺
D.保泰松
E.甲巯咪唑(他巴唑)
参考答案:A
— Where did you find the story book?
— It was in the bookstore near my house _________ I often spend my Saturday mornings. [ ]
A. that
B. where
C. when
D. which
液力偶合器的机械设备运转不平稳的原因?