ball valve oiler是什么意思 ball valve oiler在线中文翻译

ball valve oiler是什么意思，ball valve oiler在线翻译，ball valve oiler中文意思，ball valve oiler的中文翻译，ball valve oiler发音，ball valve oiler例句，ball valve oiler词组短语，ball valve oiler怎么翻译，单词ball valve oiler的意思