图示为水泵管路系统,断面2-3分别为水泵进出口断面,水泵扬程的计算公式为:()
A. (A)
B. (B)
C. (C)
D. (D)
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Datatransferisslowbetweenthesourceanddestination.ThequalityofservicerequestedbythetransportlayerintheOSIreferencemodelisnotbeingmaintaineD.Tofixthisissue,atwhichlayershouldthetroubleshootingprocessbegin?()
A. presentation
B. session
C. transport
D. network
E. physical
Whichcommandrevealsthelastmethodusedtopowercyclearouter?()
A. showreload
B. showboot
C. showrunning-config
D. showversion
《铁路乘车证管理办法》临时定期、软席、硬席、探亲乘车证的有效期间为()个月,可跨年填发。
A. 1
B. 3
C. 6
D. 9