医疗设备使用评价制度包括哪几个方面的内容？
参考答案：包括临床使用效果、功能开发、社会效益、成本效益等。
可以导致心力衰竭加重的因素（）
A.情绪激动
B.感染
C.回心血量不足
D.不恰当使用β受体阻滞剂
E.以上均可
An internet is a combination of networks connected by (26) ．When a datagram goes from a source to a (27) ，it will probably pass many (28) until it reaches the router attached to the destination network．A router receives a (29) 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 (30) is the optimum pathway
A．destination
B．resource
C．packet
D．source
