A standard non-destructive testing probe may be coupled with a localization system according to the invention so as to determine the position of the apparatus on the surface to be analyzed at any moment. The process includes forcing a first buffer to a center of gravity of the plurality of leaves, inserting a set of second buffers so each leaf is driven by an inserted buffer without timing violations, and moving the first buffer to a center of gravity of the set of second buffers. 01 to 5% by mass of an unsaturated carboxylic acid unit, 0 to 44. The latch members are supported by rods that pass through the latch carriage. When one of the drawers is pulled out, the slide base will go down to let the lock member escape from the slide base, and the slide base then goes up to prevent other drawers from sliding out, thus only one drawer can be pulled out at one time, which avoids potential danger when the center of gravity of the tool cabinet is shifted due to too many drawers being slid out at one time.