单项选择题
A.2-3B.3-4C.10D.0
A.B/2+6B.B/4C.B/4+6D.B/2
A.BP点B.SNP点C.PB点D.袖笼
A.5/6袖窿深B.2/3袖窿深C.1/2袖窿深D.1/3袖窿深
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