preventive maintenance does indeed help with the lifespan etc.
If you are feeling tired or fatigued when operating machinery, stop and rest for fear of mistake. So , two is also correct
4if you dress inappropriately it may cause danger from getting caught in machinery or catching a flame depending on the worksite. so four is correct. Newer models are most likely more updated and have different operations then the last machine. so yes read the manual before using it. so yet again 5 is also correct.
