止回瓣 non return flap: 逆止门non return flap valve: 止回瓣阀non return: 不归零制(磁记录); 止回alternating non-return-to-zero: 交替不归零制ball non-return valve: 单向球阀; 球形止回阀; 球形止逆阀下载手机词典可随时随地查词查翻译