单项选择题
A.5°~10° B.10°~15° C.15°~20° D.20°~25°
A.45°B.60°C.75°D.90°
A.10°~30° B.30°~45° C.60°~75° D.90°~93°
A.5°~15° B.10°~20° C.0°~10° D.-5°~-20°
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