The main idea of this passage is that ______.
A.TV and radio can amuse us with beautiful songs and music
B.TV and radio have weakened our interest in entertaining ourselves
C.people should not be too lazy or embarrassed to sing
D.parents should sing songs and read books aloud to their children
第1题
A.fiberdispersion
B.signalattenuation
C.transmitterpower
D.amplifierbandwidth
E.receiverdispersiontolerance
第2题
A. dispersion
B. Optical SNR
C. span attenuation
D. four wave mixing
E. receiver sensitivity
第3题
A.AgentRouting
B.HistoricalReporting
C.ConditionalRouting
D.PrioritizedQueueing
E.AgentQueueing
第4题
A.0ps/nm
B.340ps/nm
C.200ps/nm
D.3400ps/nm
E.Moreinformationisneeded.
第5题
A. the K1 SONET byte; the K2 SONET byte
B. the K2 SONET byte;the K1 SONET byte
C. transmitter switching;receiver detection
D. Line Overhead bytes;Path Overhead bytes
E. Path Overhead bytes;Line Overhead bytes
第6题
A.TheglasscoreisdopedwithanErbiuminperiodicsegmentsofthefiber.
B.Layersofhighindex?andlowindex?materialaredepositedonaglasssubstrate.
C.Thinlayersofsilicaglassareplacedontowaferstoproduceaprism-likeeffect.
D.Fiberisetchedwithanultravioletlaserthatispreciselyspacedforspecificwavelengthfiltering.
第7题
A.supervisoryrecording
B.WrapUptimer
C.sendinge-mails
D.keystrokemacros
E.textchat
第8题
A.textchat
B.LogOut/NotReadyreasoncodes
C.WrapUpState
D.WrapUptimer
E.competency-basedrouting
第9题
A.offsettheOADMlossatsiteB
B.overcomethehighmultiplexerlossatsiteA
C.amplifysignallevelsafterthehighlossthroughFiberSpan1
D.adjustaddchannelsatsiteBtobeatthesamelevelasthepassthroughchannels
E.ensurethattheperchannelpowerishigherthantheminimumneededforthepost-ampatSiteB
第10题
A. SDH circuit over a SONET network delivering it as an SDH signal
B. SDH circuit over a SONET network delivering it as a SONET signal
C. SONET circuit over an SDH network delivering it as an SDH signal
D. SONET circuit over an SDH network delivering it as a SONET signal
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