Cov tau txais ntawm daim ntawv thov ntawm submersible dej phwj

1. Kev tawm ntawm cov tshuaj lom neeg muaj kuab paug los ntawm cov chaw tshwj xeeb thiab cov lag luam.
2. Kev ua kua ntawm cov nroog dej phwj hauv nroog kho.
3. Dej phwj dej tawm hauv chaw nyob.
4. Kev ua kua nthwv dej ntawm cov neeg tiv thaiv kev tiv thaiv kev tiv thaiv.
5. Dej lwj ntawm tsev kho mob thiab tsev so.
6. Cov chaw tsim khoom lag luam thiab cov chaw tsim khoom.
7. Kev tshawb nrhiav thiab tsuas yog cov tshuab.
8. Nyob deb nroog beeks thiab farrigation dej.