PAT keyhole question

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

superdmd30

Full Member
10+ Year Member
Advertisement - Members don't see this ad
Can anyone explain the answer's of this question?

thanks.
 

Attachments

  • ???? 2013-01-14 ?? 4.45.00.png
    ???? 2013-01-14 ?? 4.45.00.png
    23.1 KB · Views: 137
Last edited: