As a general maintenance professional it is very helpful to have a long list of skills. Talk to the interviewer about the variety of skills that you possess.
"I would consider myself a very well rounded maintenance professional because my background is so diverse. I began my career as an electrician and have trained professionally as a plumber and also bring experience in HVAC. If I don't have direct experience, I will conduct some research on the topic and can generally pick it up very quickly."
Entry Level answer example
"At this time, the bulk of my educational focus has been on plumbing, with a small amount of knowledge in electrical. I do hope to consider myself to be a jack of all trades. However, I am not quite there yet."
Experienced answer example
"I have been a maintenance professional for over twelve years and can say, with certainty, that I am a jack of all trades. I can do it all! Are there specific skills that you would like me to highlight for you?"