Sharmar - certainly the industries you mention are seen as traditional feeder industries into top MBA programs, so it's not surprising that there are many people with those background who go to these schools. However, a large portion of the class does not come from these industries (the exact percentages will vary by school).
What matters most is the experience you are getting at your job, rather than the industry in which you work. If you're getting project and leadership experience that will allow you to demonstrate to the adcom that you have the leadership and teamwork skills, and career progression/success that they are looking for, you will do ok.
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