Question

what needs to happen before cheri can use the respirator? training medical evaluation fit testing all of these

Explanation:

Before using a respirator, especially in a confined space, several safety - related procedures are necessary. Training ensures the user knows how to operate the respirator correctly. A medical evaluation checks if the user is physically fit to use the respirator (e.g., no pre - existing conditions that could be aggravated by wearing it). Fit testing makes sure the respirator forms a proper seal on the user's face, which is crucial for its effectiveness. Since all these aspects (training, medical evaluation, and fit testing) are essential for safe and proper use of the respirator, the most comprehensive answer is that all of these need to happen.

Answer:

All of these