relay valve top cover

例句：

1. 1. The relay valve top coveris a crucial component in the electrical system.
   接力阀顶部覆盖是电气系统中的关键部件。
2. 2.The engineer carefully inspected the relay valvetop cover before installation.
   工程师在安装前仔细检查了接力阀顶部覆盖。
3. 3. The relayvalve top cover plays a vital role inmaintaining the integrity of the electrical circuit.
   接力阀顶部覆盖在维护电气电路完整性方面起着至关重要的作用。