试题与答案

暑邪伤人可见口渴喜饮,气短乏力是由于A.暑为阳邪,其性炎热B.暑邪伤气,湿热弥漫C.

题型:单项选择题

题目:

暑邪伤人可见口渴喜饮,气短乏力是由于

A.暑为阳邪,其性炎热
B.暑邪伤气,湿热弥漫
C.暑性升散,耗气伤津
D.暑邪挟湿,湿困脾阳
E.暑性炎热,腠理开泄

答案:

参考答案:C

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题型:单项选择题

The TCP protocolis a (1)layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides of the globe. In other words, each connection creates a (2) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting a fixed retransnussion time for all connections can result in serious consequences. If the retransmission time does not allow enough time for a (3) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransmission time is longer than necessary for a short path, it may result in delay for the application programs. Even for one single connection, the retransmission time should not be fixed. A connection may be able to send segments and receive (4) faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time, a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(5) by basing it on the round-trip time (RTT). Several formulas are used for this purpose.

(4)是()

A.connections

B.requests

C.acknowledgments

D.datagrams

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