下列词语中，没有错别字的一组是（） A．义肢膏梁妄年交放浪行骸 B．消溶撇弃印花

颈静脉怒张及肝颈静脉回流征（+）提示（）

A.左心衰竭

B.心包炎

C.全心衰竭

D.右心衰竭

E.心肌病

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (71) numbers to accomplish this．Another responsibility is to providecontrol mechanisms at the transport level．UDP does this task at a very minimal level．There is no flowcontrol mechanism and there is no (72) for received packet．UDP, however,does provide errorcontrol 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 (73) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74) station to make the connection with the receiver,chop the stream into transportable units，numberthem，and send them one by one．It is the responsibility of the transport layer at the receiving end to waituntil all the different units belonging to the same process have arrived，check and pass those that are (75) flee，and deliver them to the receiving process as a stream．

A．jobs

B．processes

C．programs

D．users

若一个单处理器的计算机系统中同时存在3个并发进程，则同一时刻允许占用处理器的进程数 (12) ；如果这3个进程都要求使用2个互斥资源R，那么系统不产生死锁的最少的R资源数为 (13) 个。

A．3
B．4
C．5
D．6

软件系统的可靠性主要表现在 (50) 。

A．能够进行安装多次

B．能在不同的计算机系统上进行使用

C．软件的正确性和健壮性

D．有效抑止盗版