内容标题34
<tr id='JdDXH0'><strong id='JdDXH0'></strong><small id='JdDXH0'></small><button id='JdDXH0'></button><li id='JdDXH0'><noscript id='JdDXH0'><big id='JdDXH0'></big><dt id='JdDXH0'></dt></noscript></li></tr><ol id='JdDXH0'><option id='JdDXH0'><table id='JdDXH0'><blockquote id='JdDXH0'><tbody id='JdDXH0'></tbody></blockquote></table></option></ol><u id='JdDXH0'></u><kbd id='JdDXH0'><kbd id='JdDXH0'></kbd></kbd>
分享
不锈钢内↓螺纹截止阀具有以下优点
1、结构简单，制造和维修比较方便。
2、工作行程卐小，启闭时间短。
3、密封性好，密封面间磨擦力小，寿命较长。
