()CDAudio音乐是CD唱片采用的格式,缺点是无法拷贝。
参考答案:错
Everyone was silent as the organizer ________ the result of the speech competition.
A.announced
B.pronounced
C.arranged
D.instructed
阵发性室性心动过速需要及早终止其发作,其最主要的原因是()
A.可引起心源性休克
B.可引起心功能不全
C.可引起心绞痛
D.可发生栓塞
E.可发展为心室颤动