门诊手术麻醉不宜用下列哪种药物（）
A.芬太尼
B.吗啡
C.氧化亚氮
D.氯胺酮
E.丙泊酚
参考答案：B
The two girls are twins. ________ names are Lucy and Lily.[ ]
A. They
B. They're
C. Their
D. Theirs
热泵热水除了可供洗澡用热水外，还有其它用处吗？
