简述焦炉操作管理的要点有哪些?
The main function of the lubrication system in to enable () of a film of oil between the moving parts. ["the information","the formation","the scatter","the frictio"]
全向天线无法()下倾,因此很高的全向站应该根据不同情况选择带不同角度的()下倾天线。
歌舞伎是()时代兴起的一种日本戏剧。 ["室町","桃山","江户","明治"]
简述何谓焦炉老化?
简述边缘海的可能形成机理。