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问题 单项选择题

男性，20岁，腹泻后出现心悸，心电图提示频发室性期前收缩，下述哪项不符合室性期前收缩心电图改变（）

A.提前出现宽大畸形的QRS波

B.T波方向与QRS主波方向相反

C.QRS波群前出现倒置P波

D.代偿间隙完全

E.室性融合波

答案

参考答案：C

多项选择题

绿化工程包括（）等。

A、乔灌木种植工程

B、大树移植

C、小树移植

D、草坪工程
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单项选择题

A transport layer protocol usually has several responsibilities. One is to create a process-to-processcommunication UDP uses ______ numbers to accomplish this. Another responsibility is to provide controlmechanisms at the transport level, UDP does this task at a very minimal level. There is no flow control mechanismand there is no ______ for received packet. UDP, however, does provide error control to some extent. If UDPdetects an error in the received packet, it will silently drop it.
The transport layer also provides a connection mechanism for the processes. The ______ must be able to sendstreams of data to the transport layer. It is the responsibility of the transport layer at ______ station to make theconnection with the receiver chop the stream into transportable units, number them, and send them one by one. Itis the responsibility of the transport layer at the receiving end to wait until all the different units belonging to thesame process have arrived, check and pass those that are ______ free, and deliver them to the receiving process asa stream.

A．sending

B．routing

C．switching

D．receiving
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