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问题
单项选择题
可以避免肝脏首关效应的片剂类型有
A．舌下片
B．分散片
C．多层片
D．控释片
E．糖衣片
答案
参考答案：A
解析：舌下片的特点。
选择题
We are sorry to have to announce that the Leeds train that _____ due to arrive at 12: 20 has been delayed by one hour and will now arrive at 13:20.
A. was
B. is
C. will be
D. had been
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问答题 简答题
七鳃鳗的呼吸系统有什么特点？
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