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问题 单项选择题

白内障摘除联合人工晶状体植入术后1天，角膜水肿最可能的原因是

A．人工晶状体选择不合适

B．角膜内皮细胞受损伤

C．手术切口过大

D．术后未使用抗生素

E．结膜炎

答案

参考答案：B

单项选择题

肉瘤的概念是

A．来自肌肉组织的肿瘤

B．来自黏膜肌肉组织的癌

C．来自间叶组织的恶性肿瘤

D．来自平滑肌的恶性肿瘤

E．来自上皮细胞的肿瘤
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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（22）应选择（）

A.give-up

B.abandon

C.quit

D.connection
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