简述拜访沟通法的要点。

When the system upon which a transport entity is running fails and subsequently restarts, the (1) 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 problem.

The still active side of a half-open connection can close the connection using a (2) timer. This timer measures the time the transport machine will continue to await an (3) of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer (4) , 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 restarts, half-open connections can be terminated more quickly by the use of the RST segment. The failed side returns an RST i to every segment i that it receives. When the RST i reaches the other side, it must be checked for validity based on the (5) 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.

2（）

A.give-up 

B.abandon 

C.quit 

D.connection

患儿，男，11岁。半月前咽喉肿痛，4天前眼睑浮肿、肉眼血尿，在当地医院诊为急性肾炎，给以青霉素静脉滴注，自2天前小便减少，每天不到100ml，急查血肌酐562μmol／L，BUN13mmol／L，治疗应首选的措施是（）

A.静脉滴注利尿剂

B.口服利尿剂

C.血液透析

D.腹膜透析

E.导尿

传染病中由病毒感染所致发热的四大特征是什么？

导体电阻的大小与长度成正比C.与导体体的截面积成反比（）。

λ噬菌体具有包装和转导特性。 ( )