题目内容

18．关于上腔静脉的描述，哪项是正确的？

A. 位于上纵隔中部
B. 由左、右头臂静脉在右侧第2胸肋结合处后方汇合而成
C. 沿升主动脉右侧垂直下行
D. 右侧为右迷走神经
E. 后方有食管和奇静脉

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55.关于心包的描述，哪项是错误的？

A. 由纤维心包和浆膜心包组成
B. 纤维心包是一层厚而坚韧的纤维膜，与出入心的大血管外膜相延续
C. 浆膜心包即心外膜
D. 心包腔为浆膜心包脏、壁二层互相转折围成的
E. 心包窦为心包腔的一部分

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招标投标是一种竞卖方式，对买方比较有利。（）

A. 对
B. 错

寄售方式中代销人需承担风险。（）

A. 对
B. 错