多项选择题

A.构件<12m,允许偏差为±4mm
B.构件≥12m且构件<18m,允许偏差±10mm
C.构件≥18m允许偏差为±20mm
D.构件<12m,允许偏差为±5mm
E.构件≥18m允许偏差为±25mm