Final answer:
Servicing machinery in motion can only be conducted by qualified technicians or engineers, depending on the workplace safety protocols and the nature of the machinery and task.
Step-by-step explanation:
The servicing of machinery which is in motion can only be done by qualified persons. This is generally true; however, it is dependent on the type of machine, the nature of the servicing task, and the workplace regulations and safety protocols in place. For example, certain high-risk industries have strict protocols that might allow only very specific maintenance or servicing tasks to be performed while machinery is in motion, and only by highly qualified technicians or engineers. In contrast, routine servicing, like lubrication or cleaning, may sometimes be carried out on machines in motion, but again, only by those with the requisite skills and knowledge to do so safely. It should also be noted that the use of child labor was historically employed for some tasks due to their ability to navigate small spaces in machinery, which is now largely condemned and illegal due to the inherent dangers and ethical concerns.