【名词&注释】
生长发育(growth and development)、学龄前儿童(preschool children)、下颌前突(mandibular protrusion)、上颌前突(maxillary protrusion)、脊神经(spinal nerve)、下颌后缩(mandibular retrusion)、上颌后缩(maxillary retrusion)、双颌前突(bimaxillary protrusion)、活动矫治器(removable appliance)
[单选题]活动矫治器(removable appliance)基托厚度为().
A. 1.0~1.5mm
B. 1.5~2.0mm
C. 2.0~2.5mm
D. 2.5~3.0mm
E. 3.0~3.5mm