protective gap

• 保护放电器,保险隙

protective gap的用法和样例：

例句

1. The installation of an air gap and drain line are recommended.
   建议安装气隙和排放管道。
2. This would create an air gap to eliminate any possible backflow.
   这将产生一个气隙以消除任何可能的回流。
3. The installation of an air gap and drain line are recommended.
   建议安装气隙和排放管道。
4. This would create an air gap to eliminate any possible backflow.
   这将产生一个气隙以消除任何可能的回流。