Actually, pneudraulic is a combination of pneumatic and hydraulic...
Rodney... I know I asked what questions you had, but don't you think that this is a bit excessive? Each one of these questions could use a full chapter in one of your textbooks to answer properly. If, as you say, you are studying to become an aircraft mechanic, then why not bring these questions up in class so your instructors can spend some time giving you the proper answers.
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