单项选择题
A.23° B.30° C.35° D.45°
A.缓解疲劳 B.改善视野 C.受力 D.采光
A.9 B.12 C.15 D.18
A.1000-1200mm B.1200-1800mm C.1800-2400mm D.2400mm以上
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