简介:1(1)平面上已给1002个点,将连接每两点的线段中点染成红色.证明至少有2001个红点.(2)方程(2001x)2-2000×2002x-1=0的较大根为m,而方程x2+1999x-2000=0的最小根为n,求(m-n)的值.(江苏张家港职业高级中学周文国邮编:215600)
简介:摘要:本文通过比较羽绒蓬松度新旧测试标准的差异,对蓬松度仪,搅拌棒,前处理箱以及前处理过程进行比较,并着重对新旧标准测定所得到的数值进行了比较和分析。
简介:Transmissionperformanceofelectroabsorptionmodulatorin10Gb/stransmissionsystemshasbeensimulatedandanalyzedundertheconditionoftakingintoaccountthechirp,extinctionratio,transmissivityandrise/falltime.ResultsshowthatshorttransmissiondistancewithoutEDFAafterEAMcanbeusedinfuturemetropolitanareanetwork,butthetransmissivitymustbecarefullyconsidered.Thesamplingtimerangeanddecisionlevelcanbeoptimizedtoreducethebiterrorratio.