单项选择题
A.1倍 B.1/2 C.1/3 D.1/3或不到1/3
A.100 B.117 C.200 D.234
A.0°~90°B.0°~120°C.0°~150°D.0°~180°
A.90° B.120° C.150° D.180°
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