光纤在光纤中产生吸收损耗的原因直接与（）
A.光纤材料
B.光波
C.以上都不是
参考答案：A
This picture was taken when my father was a child and even I myself couldn’t _____.
A．find him out
B．pick him out
C．put him out
D．take him out
简述征管法关于延期申报的基本规定。
