搜题请搜索小程序“爱下问搜题”
问题 单项选择题

治疗肺炎球菌肺炎时，首选的抗菌药物是

A．庆大霉素

B．三代头孢菌素

C．青霉素

D．红霉素

E．四环素

答案

参考答案：C

解析：肺炎球菌肺炎是由肺炎链球菌感染引起，一经确诊即应立即开始抗生素治疗，不必等待细菌培养结果。对肺炎球菌肺炎，青霉素G为首选；对青霉素过敏者，可选用红霉素、林可霉素和一代头孢菌素。

单项选择题

When the system upon which a transport entity is running fails and subsequently reatarts, the ___34___ 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 ___35___ timer. This timermeasures the time transport machine will continue to await an ___36___ of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer ___37___, 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 RSTi to every segment i that it receives. When the RSTi reaches the other side, it must be checked for validity dased on the ___38___ 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.

35（）

A.abandon 

B.give-up 

C.quit 

D.connection
查看答案
单项选择题

用于去除乙烯单体十分有效的矿物质不包括（）。

A、氧化钙

B、沸石

C、方石英

D、碳酸盐
查看答案