须检查的杂质为洋地黄毒苷的物质为（）。
A．蔗糖
B．乳糖
C．地高辛
D．洋地黄毒苷
E．葡萄糖注射液
参考答案：C
解析：
地高辛的分析
— Are these your keys?
— No, _____ aren't. I think they're _____ keys. [ ]
A. you ; his
B. they ; they
C. they ; her
D. them ; his
脉冲重覆频率（HZ）
