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[单选题]
上颌窦内提升,预备种植窝时需保留( )窦底骨板
A.3~4mm
B.1~2mm
C.0.5~1mm
D.1.5mm~2.5mm
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B
答案解析
A.3~4mm
B.1~2mm
C.0.5~1mm
D.1.5mm~2.5mm