单项选择题

This autumn, 6,000 residents will participate in the firstphase of the National Fitness Program.
A、stage
B、part
C、time
D、era

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单项选择题
IntheOSNRmodelforEDFAamplifiers，SNROUT=1／（1／SNRIN＋FhvB／PIN），whatdoesSNRINrepresent？（）
A.thesignaltonoiseofthecurrentopticalamplifier
B.thesignaltonoiseofthepreviousamplifierorsource
C.thesignaltonoiseintroducedbytheopticalmultiplexer
D.theaccumulatednoisetosignalratiooftheopticalchannel
单项选择题
Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS－1 timing source?（）
A.DUS
B.line
C.loop
D.internal
E.through
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