题目:
血/气分配系数最小的是()
A.恩氟烷
B.异氟烷
C.七氟烷
D.地氟烷
E.氧化亚氮
答案:
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One possible version:Dear Puzzled,August 25th, 2008Thank you for your letter. You asked me about how to improve your listening and spoken English. Here are some tips for...