搜题请搜索小程序“爱下问搜题”
问题 单项选择题

免疫自稳功能是指

A．机体识别排除抗原性异物的功能
B．机体识别排除病原体的功能
C．机体识别排除衰老死亡细胞的功能
D．机体识别排除胞内寄生物的功能
E．机体识别排除突变细胞的功能

答案

参考答案：C

单项选择题

异位妊娠最常见种植在下列哪一项?

A.卵巢 

B.腹腔内 

C.输卵管 

D.后腹膜间隙内 

E.肠壁上
查看答案
单项选择题

When the system upon which a transport entity is running fails and subsequently reatarts, the ______ information of all active connections is lost. The affected connections become half-open, as the side that did not fail does not yet realize the promble.
The still active side of a half-open connections using a ______ timer. This timermeasures the time transport machine will continue to await an ______ of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer ______, the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user.
In the event that a transport entity fails and quickly restart, half-open connections can be teminated more quickly by the use of the RST segment. The failed side returns an RSTi to every segment i that it receives. When the RSTi reaches the other side, it must be checked for validity dased on the ______ number i, as the RST could be in response to an old segment .If the reset is valid, the transport entity performs an abnormal termination.

A. connection B. acknowledgment C. sequenceD. message
查看答案