下列肝毒性最强的是()
A.氟烷
B.甲氧氟烷
C.恩氟烷
D.异氟烷
E.七氟烷
参考答案:A
___ _ make progress, she has been studying hard.
A.So as to
B.In order to
C.So that
D.In order that
宽带ISDN的业务中,可视电话属于以下哪种业务
A.广播性业务
B.消息性业务
C.会话性业务
D.检索性业务