Manhole Pwm yog qhov tseem ceeb ntawm kev tsim kho hauv nroog thiab feem ntau siv hauv cov chaw hauv qab no:
1. Kev Siv Hauv Nroog: Kev tsim kho hauv nroog yuav tsum muaj ntau tus neeg txiav tawm rau kev teeb tsa thiab kev saib xyuas ntawm cov raj av hauv av. Manhole Pwm tuaj yeem ua tau kom tau raws li kev tsim khoom lag luam uas xav tau ntawm Manholes ntawm ntau qhov ntau thiab tsawg thiab cov duab, muab kev txhawb nqa muaj zog rau kev tsim kho hauv nroog.
2. Kev Siv Hluav Taws Xob: Kev Siv Hluav Taws Xob yog qhov tseem ceeb ntawm cov chaw hauv nroog loj, thiab Manhole Pwm, thiab Manhole Pwm, thiab Manhole Pwm, thiab Manhole Pwm, thiab Manhole Pwm, thiab Manhole Pwm, thiab Manhole Pwm Los ntawm kev ua cov manholes ntawm ntau qhov ntau thiab tsawg thiab cov duab, peb tuaj yeem ntsib cov kev xav tau ntawm cov dej ntws.