办公室的4台计算机组成了如图所示的网络。从覆盖范围来看，该网络属于（）。

[单选题]When the system upon which a transport entity is running fails and subsequently restarts,the(21) 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 connections can close the connection using a(22)timer. This timer measures the time the transport machine will continue to await an (23) of a transmitted segment after the segment has been retransmitted the maximum number of times.When the timer (24),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 (25) 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. 空白处（22）应选择（）

[单选题]规范规定在钻孔桩灌筑时，灌筑导管底端至孔底距离应为0.3～0.5m，初灌时导管首次埋深应不小于（）。

[单选题]关于脑血流量与神经源性调节，哪项错误（）

[单选题]失控船在白天应悬挂的号型是（）

[单选题]一次咯血量≥（）为大量咯血

[问答题]怎样认识惯例经验与艺术发展的辩证关系？

[问答题]桩孔开挖有哪些规定？

[判断题]旋风筒锥体下部翻板阀的抖动情况，不能作为旋风筒锥体是否堵塞的主要依据。

[多选题]（）不能做为乘车的凭证。

[多选题]道岔区轨枕埋入式无砟道床伤损形式有（）。