plain-straight-face flange

例句：

1. 1.The engineer used a flat face flange to attach the pipe to the machine.
   工程师使用一个平板式面罩将管子连接到机器上。
2. 2. The construction crew had to remove the flat face flange before starting the project.
   施工队在开始项目之前必须拆除平板式面罩。
3. 3.The technician carefully removed the flat face flange to inspect the seal.
   技术员小心翼翼地移除平板式面罩来检查密封。