Joyside A02 Series, Инструкция по эксплуатации

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16
8
d1=d2
Rt
∠
90
Noting :
Pls make sure that the length of d1 is the same as d2 ， then
go ahead the next step to make sure the frame is square.
Keep the beam at right angles to the column,
the column
is at right angles to the ground
，
and keep the beam level.