Which condition is necessary for a substance to burn?（）
1、Which commands is necessary to permit
Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwiseconfigured for these vty line protocols?（）Atransport type allBtransport output allCtransport preferred allDtransport input all
2、It is necessary for us （） after having
It is necessary for us （） after having served for a certain period.Ato change the lube oilBhave the lube oil purifiedChave the lube oil burntDto analyze the lube oil
3、28． Which is a good place for studying
28． Which is a good place for studying?A A clean and beautiful place．B The place with a computer．C The place with a television and a radio．D A quiet place with a chair ,a desk and some study materials．
4、Which timing mode is appropriate for a
Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）ADUSBline timingCloop timingDinternal timingEthrough timing
5、Which of the following is NOT a condit
Which of the following is NOT a condition for deadlock?AStarvationBCircular waitCNo preemptioDMutual Exclusion
6、A diesel engine which is rated for nor
A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.Aslow-speed dieselBmedium-speed dieselChigh-speed dieselDconstant-speed diesel