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问题 单项选择题

在燃煤发电厂高压厂用电母线设置中，下列哪种表述是不正确的？（）

A.高压厂用电母线应采用单母线接线

B.锅炉容量在230t/h时，每台锅炉可设一段高压母线

C.锅炉容量在400~1000t/h，每台锅炉应由2段高压母线供电，2段母线宜由2台变压器供电

D.锅炉容量在1000t/h时，每一种高压母线应为2段

答案

参考答案：C

单项选择题

在Campylobacter-BAP培养基上下列哪种试验可以用于鉴别弯曲菌。（）

A.还原亚硝酸盐

B.尿素

C.马尿酸水解试验

D.产H2S

E.触酶
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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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