单项选择题
A.45° B.30° C.60° D.15°
A.60° B.90° C.120° D.30°
A.1尺×1尺 B.1尺×10尺3 C.1寸×1寸 D.4.1寸×1尺
A.1/300 B.1/400 C.1/500 D.1/3000
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