最容易产生不可逆心脏毒性的局麻药是（）
A.利多卡因
B.普鲁卡因
C.布比卡因
D.罗哌卡因
E.丁卡因
参考答案：C
试述右肺中叶不张的X线表现？
31. An e-pal, as you have known, means a friend ______ you write e-mails.
A．to which
B．for whom
C．about whom
D．to whom
