=______．

X综合征患者冠状动脉造影结果应为（）

A.左冠状动脉主干病变

B.右冠状动脉主干病变

C.三支血管病变

D.麦角新碱试验显示冠状动脉痉挛

E.冠状动脉造影正常

下列哪个选项是合法的标识符

A．123

B．_name

C．class

D．1first

在弯曲过程中，依靠调整上下轴辊的相对位置，可以将坯料弯曲成（）上辊曲率的任意曲率。

A、大于

B、稍大

C、小于

D、等于

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 routerattached to the destination network. A router receives a （4）from a network and passes it toanother network. A router is usually attached to several networks. When it receives a packet, towhich network should it pass the packet The decision is based on optimization: Which of theavailable（5） is the optimum pathway

（5）是（）

A.pathways

B.routers

C.diagrams

D.calls