17. For a measurement that must be made within one ten-thousandth of an inch, Technician A uses a machinist 's rule. For the same accuracy, Technician B uses a standard micrometer. Who is correct? 2. Technician A c. Both A and B b. Technician B d. Neither A nor B 18. Technician A says portable floor jacks are operated by hydraulics. Technician B says portable floor jacks may be operated by compressed air. Who is correct? a. Technician A c. Both A and B b. Technician B d. Neither A nor B 19. Technician A uses a -inch Wrench to turn a 14-millimeter nut. Technician B uses a% 16-inch Wrench to hold a 14-millimeter nut. Who is correct? a. Technician A c. Both A and B b. Technician B d. Neither A nor B 20. When using an air impact wrench, technician a uses impact sockets and adapters. Technician B uses chrome-plated Sockets. Who is correct? a. Technician A c. Both A and B b. Technician B d. Neither A nor B