A plumber must move a heavy cast-iron water heater and lengths of pipe across a jobsite. What is the safest material-handling practice?

Giải thích

Safe material handling means sizing up the load and using mechanical aids like dollies or hand trucks, or getting help for heavy or awkward items, rather than overloading one person. Proper body mechanics, keeping the load close, bending the knees, lifting with the legs, and not twisting, reduce back injuries, which are among the most common in the trades. Planning the path and clearing obstacles also prevents strains and drops.