搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1型题

初产妇，妊娠36周，不慎被外物撞击腹部后，感腹痛，伴少量 * * 流血，自感胎动消失。检查未闻及胎心。诊断为（）

A.胎盘早剥

B.先兆子宫破裂

C.先兆早产

D.脐带脱垂

E.前置胎盘

答案

参考答案：A

单项选择题

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．

（4）处应填（）。

A．sending

B．routing

C．switching

D．receiving
查看答案
问答题 简答题

请简述在升降带平整区和跑道端安全地区从事碾压工作的规程？
查看答案