患者女性,48岁,因"慢性阻塞性肺病急性发作,Ⅱ型呼吸衰竭,肺性脑病"入院,予气管插管机械通气治疗。1天后患者神志转清,PaCO2由1O2mmHg降至45mmHg。该患者机械通气潮气量的调节,主要根据下列哪一条()
A. 患者意识状态
B. 血气动态变化,结合pH值
C. 肺泡-动脉氧分压差
D. PaO2
E. SpO2
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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(21)应选择()
A. data
B. state
C. signal
D. control
在计算现浇雨篷混凝土工程量时,当其伸出墙外的长度大于2m时,应如何计算其工程量?