Question

specified on a sticker, located on the lifting arm. never exceed the maximum load capacity of jack.
prevent the vehicle from rolling. this can be achieved by applying the parking brake or by placing chocks behind the wheels that are not being lifted.
always work on firm, level flooring (preferably concrete) to prevent the ground and the car from dropping off the jack. the shop floor should be clean, free of dirt and debris, that could keep the wheels from rolling freely.
the jack support cup should be positioned under a solid point on the car body or chassis.
often the car manufacturer specifies designated lifting points. these lifting points are shown in the corresponding service information and/or vehicle owners manual. positioning the jack at a non - designated lift point is dangerous and could cause damage to the vehicle.
note: some vehicles are designed with lift points that require a special adapter to be used in conjunction with the floor jack.
what about the shop floor should be checked, before you attempt to lift the vehicle with a floor jack?
the floor should be firm (preferably concrete).
the floor must be level.
the floor should be sprinkled with \floor dry\, to absorb any oil leaking from the jack.

Explanation:

The text states that when using a floor - jack to lift a vehicle, the shop floor should be firm (preferably concrete) and level, and free of dirt and debris. There is no mention of sprinkling "floor dry" on the floor.

Answer:

The floor should be firm (preferably concrete).
The floor must be level.