Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work. ["exchange","to exchange","exchanging","exchanged"]
资源性产品的价值应当包括资源性产品的（） ["天然价值","人工价值","代际补偿价值","外部补偿价值"]
この（）にこくせきとじゅうしょを書いてください。 ["紙","神","髪","上"]
人によって性格が違うように、ことばや（）も民族によって違います。 ["慣例","習慣","風習","風俗"]
EXCEL 2002中，下列（）操作不能清除一组单元格中的数据。 ["单击每个单元格并删除“编辑”栏中的词或字母","选择要清除的单元格并从“编辑”菜单中选择“清除”命令，再从“清除”子菜单中选择“内容”命令","选择要清除的单元格，右击并从快捷菜单中选择“删除”命令","一次选择一个要清除的单元格并按Del键"]
粉体表面改性剂主要有哪些品种？
