简要叙述熔接法光纤连接的流程?
(1)光纤端面的处理 :去处一次涂层、切割、制备端面(2)光纤的对准及熔接(3)连接质量的评价(4)接头的增强保护
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Asfarassheisconcerned,onepieceofmusicisverymuchlike
ThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.
函数f(x)=2x+a/π2(a﹥0),在(0,+∞)内最小值为f(x0)=12,则x0=
Ifyougetyourbanktogenerateamoneyorder,itusually______conversionfees.
x,y,z是三个正整数,已知3x=4y=7z,那么x+y+z的最小值是多少?