A、<span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt">结构有较多错层</span>
B、<span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt">质量分布不均匀</span>
C、<span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt">抗扭刚度低</span>
D、<span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt">刚度、承载力、质量分布均匀、无突变</span>