insert flapper valve
[新英汉石油技术词典]
insert flapper valve嵌入式舌形阀
是什么意思,insert flapper valve的解释,insert flapper valve的翻译
[石油英汉词典] insert flapper valve
insert flapper valve
[新英汉石油技术词典]
insert flapper valve是什么意思,insert flapper valve的解释,insert flapper valve的翻译
[石油英汉词典] insert flapper valve