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问题 单项选择题

4岁以L先天性髋脱位的治疗可用

A．带蹬吊带法
B．手法复位，石膏固定
C．骨盆截骨(Salter)术
D．骨盆内移截骨(Chiafi)术
E．人工关节置换术，

答案

参考答案：C

单项选择题

催化剂堆积时，把微孔体积计算在内的密度叫做催化剂的（）。

A、骨架密度

B、颗粒密度

C、真实密度

D、堆积密度
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单项选择题 共用题干题

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（23）应选择（）

A.reset

B.acknowledgment

C.sequence

D.synchroizer
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