更换光板时,带好防静电手腕,先拔掉光板上的尾纤,再拔光板,禁止 光板

此题为判断题(对，错)。

A.使用OTDR对光缆进行测试，直接判断是光缆问题还是板件问题通过测量光缆系统备纤或测试在用纤芯

B.使用光功率计测量光缆两端光板的发送和接收光功率，若对端光板发送光功率正常，而本端接收光功率不正常，则说明是光缆问题，若光板发光功率已经很低，或与原始数据相比下降很多，则判断为光板问题，进行换板处理以上操作可以结合网管性能值综合判断

C.采用自环法，即使用尾纤对光板收发自环，若自环后光板红灯仍有三闪告警或网管上R_LOS告警不消除，则说明是光板问题，若自环后红灯熄灭及网管上R_LOS告警消除，则说明光板正常

D.线路板收发光口脏，光纤适配器接触不良.松动，光纤分配架到线路板尾纤保护不好.严重扭曲等也能引起R_LOS告警

此题为判断题(对，错)。

_____, I could not memorize the text.However hrd did I tryB．However hrd I triedC．However I tried_____, I could not memorize the text.However hrd did I try B．However hrd I tried C．However I tried hrd D．However I hd tried hrd

A．However hard did I try

B．However hard I tried

C．However I tried har

D．However I had tried hard