15. This refers to a list that identifies all the things needed to borrow or request before doing a drafting task. a. Inspection Request Form c. Visual Inspection Report b. Purchase Requisition Slip d. Tools and Materials Checklist 16. This is caused by accidentally or deliberately hitting the edges of these tools on a hard surface. a. cracks c. rusting b. blocking/clogging d. chipped/nicked edge 17. This refers to the dulled printed hatch marks on the surface of measuring Instruments. a. cracks c. missing part b. warped surfaces d. faded hatch mark 18. These chambers are sometimes blocked because of broken lead or dry ink. a. rusting c. missing part b. warped surfaces d. blocking/clogging 19. This occurs when tools are dropped to any hard place/object. a. cracks c. missing part b. warped surfaces d. faded hatch marks 20. It happens when metal drafting tools are exposed to moisture or kept in a humid place. a. rusting c. dull points b. blocking/clogging d. faded hatch marks​