单项选择题
A.5 B.10 C.15 D.20
A.内侧面75°至外侧面45° B.内侧面45°至外侧面45° C.内侧面75°至外侧面75° D.内侧面45°至外侧面75°
A.70‰ B.80‰ C.90‰ D.100‰
A.0.3 B.0.48 C.0.5 D.0.58
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