Questions 13 to 15 are based on the conversation you have just heard.
A space plane is bigger than an ordinary plane.
B. A space plane looks totally different from an ordinary plane.
C. A space plane carries more passengers than an ordinary plane.
D. A space plane travels much faster than an ordinary plane.
出现长PP间距，且长PP间距不是短PP间距的整数倍，应考虑
A. 窦性停搏
B．二度Ⅱ型窦房阻滞
C．窦性心动过缓
D．病态窦房结综合征
E．二度Ⅰ型窦房阻滞
Instead of showing ______ , your dress should convey the mesage that
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