permanent friction loss永久: permanent; perpetual; everla ...摩擦: rub; chafe损失: lose壁摩擦损失: wall-friction loss摩擦损失: frection loss; friction (or fric- tional) loss; friction loss viscous loss; friction losss; frictional losses; loss due to friction下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:永久摩擦损失，即可在微信中查询翻译
