词汇	Sadd valve
释义	Sadd valve 双口鸭嘴活瓣
随便看	all rise All rise All rising to great place is by a winding stair all risk all-risk all risk account receivable all risk clause all risk clauses all risk cover all risk covers allrisk insurance all risk insurance all-risk insurance all-risk insurances All Risk Management all risk policy all-risk policy All rooms are linked to the main switchboard All rooms have double-glazed windows All rooms have got private bath All rooms have got private bath,shower and WC all risks all-risks all risks clause all-risks clause