Lub tsho khuam buoyancy muaj kev tiv thaiv kev txav mus los, muab ob npaug rau cov qauv kev nyab xeeb, thiab txhim kho kev nyab xeeb.
Plaub dai cov ntsiab lus nyob rau pem hauv ntej, hlau hloov buckle ntawm lub xub pwg nyom, buoyancy 120N
