白居易在《放言》一诗中说：“试玉要烧三日满，辨材须待七年期。”这句诗告诉我们

① 检验认识需要一个过程

② 要准备走曲折的道路

③ 真理是具体的有条件的

④ 事物本质的暴露和展现有－个过程

A．①②

B．②③

C．①④

D．③④

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 RST_i to every segment i that it receives. When the RST_i 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. dataB. control C. signal D. state