题目内容

二尖瓣

A. 可分为前、后两瓣
B. 前瓣较小，介于左房室口与主动脉口之间
C. 前瓣位于前外侧，后瓣位于后内侧
D. 后瓣分隔流入道和流出道
E. 前瓣的腱索连于前乳头肌

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三凹症

混淆品

肺动脉

A. 肺动脉中含动脉血
B. 左肺动脉较长，向左行至左肺门
C. 右肺动脉向右经升主动脉与上腔静脉之间达右肺门
D. 肺动脉于全长被心包所包围
E. 在肺动脉干分叉处的稍右侧有动脉带连于主动脉弓下缘

An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?空白（5）处应选择（）

A. pathways
B. routers
C. diagrams
D. calls