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问题 单项选择题

暴雨导致井盖被冲开，有人被冲入下水道致死，这种例子近年来在全国多地都发生过。请问，下暴雨了，如果看到马路积水处出现漩涡，同学们应该怎样走。（）

A、从漩涡处跳过去

B、从漩涡边上小心走过去

C、绕着走

答案

参考答案：C

单项选择题

便携式天然气检测仪采用（）采样方式。

A、引射式

B、引流式

C、自然扩散式

D、自然放散式
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单项选择题

When the system upon which a transport entity is running fails and subsequently restarts, the (136) 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 (137) timer. This timer measures the time the transport machine will continue to await an (138) of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer (139) , 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 (140) 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.

A．stops

B．restarts

C．expires

D．abandons
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