non-return flap

flap的翻译中文意思-在线英汉词典 ... moving outlet flap 活动排风幕 non-return flap 逆止门, 止回瓣 nose flap 【航空】前缘襟翼 ...

航海及海运专业英语词汇(N2) ... non-return flap valve 止回瓣阀 non-return flap 止回瓣 non-return suction 止回吸入口 ...