A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (1) numbers to accomplish this．Another responsibility is to provide control mechanisms at the transport level．UDP does this task at a very minimal level．There is no flow control mechanism and there is no(2) for received packet．UDP, however, does provide error control to some extent．If UDP detects an error in the received packet，it will silently drop it． The transport layer also provides a connection mechanism for the processes．The (3) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units，number them，and send them one by one．It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived，check and pass those that are (5) free, and deliver them to the receiving process as a stream．

（3）处应填（）。

A．jobs

B．processes

C．programs

D．users

今日公司与荣发公司的合同纠纷，经过县人民法院与市中级人民法院两审终审后，基于今日公司的再审申请。省高级人民法院决定再审。再审审理过程中，省高级人民法院发现县人民法院和市中级人民法院进行审理时违反法定程序，可能影响本案的公正判决。对此，省高级人民法院应( )。

A．裁定撤销市中级人民法院的二审判决，由市中级人民法院再审

B．裁定撤销市中级人民法院的二审判决，发回市中级人民法院重申

C．裁定撤销一、二审判决，发回市中级人民法院重申

D．裁定撤销一、二审判决，发回县人民法院重审