单项选择题
A.SNP点B.SP点C.BP点D.CP点
A.0~1cmB.0~2cmC.1~3cmD.1~2cm
A.16°B.19°C.18°D.22°
A.B/24B.B/24+3.4C.B/24+3.6D.B/24+3.9
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