题型:选择题 It is hard for people in the country to believe that the soldier could survive in such ________ weather conditions.[ ]A. seriousB. severeC. positiveD. sceptical 查看答案
题型:单项选择题 根据线路光功率检测的情况,通过网管调整LAC板中的电可调光衰减器(EVOA),以保证在运行过程中各光放段的功率点、接收端的接收功率维持正常值。LAC板包括()板LACT板2种类型。A、LACEB、LACFC、LACGD、LACL 查看答案