单项选择题
A.0ο< SUP>,无肩台B.2ο< SUP>~5ο< SUP>,0.5~0.……
铸造全冠预备时,轴壁正常聚合角及颈部肩台要求
A.0<SUP>ο</SUP>,无肩台
B.2<SUP>ο</SUP>~5<SUP>ο</SUP>,0.5~0.8mm
C.2<SUP>ο</SUP>~5<SUP>ο</SUP>,0.8~1.5mm
D.6<SUP>ο</SUP>~10<SUP>ο</SUP>,0.8~1.5mm
E.6<SUP>ο</SUP>~10<SUP>ο</SUP>, 1.5~2.0mm