WhichstatementaboutMPLStrafficengineeringpolicy-basedtunnelselection（PBTS）isnottrue？（）
A. Thetunnelthatisnotconfiguredwiththepolicy-classcommandactsasthedefault
B. EXPselectionisbetweenmultipletunnelstothesamedestination
C. ThereisnorequirementforIGPextensions
D. Tunnelsareconfiguredusingthepolicy-classcommandandcarrymultipleEXPvalues
E. ItsupportsVRFtraffic，IP-to-MPLSswitching，andMPLS-to-MPLSswitching
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Whatarethemandatory，well-knownBGPattributes？（）
A. origin，AS-path，next-hop
B. AS-path，origin，MED
C. AS-path，origin，weight
D. AS-path，weight，MED
WhatisoneoftheprimaryoverheadfieldsassociatedwiththeOpticalPayloadUnit（OPU）？（）
A. pathmonitoring
B. tandemconnectionmonitoringactivationdeactivation（TCMACT）
C. PayloadStructureIdentifier（PSI）
D. multiframealignmentsignal（MFAS）
E. sectionmonitoring
3，5Br2-PADA分光光度法测定水中银时，水样中相对于银含量（）倍的银（III）对银的测定无影响。
A. 200
B. 500
C. 1000
D. 1200
Whenwilltheprimaryprocessorcoredumprunincaseofaswitchover？（）
A. nevertakesplace
B. periodically
C. duringswitchover
D. afterswitchover
E. beforeswitchover
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