Have just finished reading a 2 page acknowledgement - YES.
Mine is a couple lines, then a small para, then a couple lines. People in this order -
1. Supervisor who is my mentor
2.Parents
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3. Para with - gran who raised me, friends and family unnamed one sentence, project I worked on, thesis committee, funding bodies, departmental folk, participants, academics who provided useful criticims
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4. Two sentences on my lovely friend, co-author, sounding board, philosopher. Without him, this thesis would truly not have been written, tacky as that sounds.