空白抬头、空白背书的提单是指既不填写收货人，又不要背书的提单。（）
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知识产权海关保护备案的有效期为7年。（）
A. 对
B. 错
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
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