Warning: file_put_contents(/www/wwwroot/zidian/biehu.cn/cache/f4216e7568f44f202294881472d34e6e.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/biehu.cn/index.php on line 58 leak-tightness例句_leak-tightness英汉例句_leak-tightness双解例句_甲百汇小鸡词典
A valve should not leak, moreover internal tightness is an essential functionality that must be tested and verified before start-up. 阀门不应该泄漏，而且内部密封性是必须在启动之前就进行测试并检验的一项基本的功能特性。