单项选择题
A.>10°B.>5°C.>15°D.>20°
A.不大于200mm B.不大于500mm C.不小于200mm D.不小于500mm
A.＞1.5m B.≤1.5m C.≥1.5m D.＜1.5m
A.＞1.5m B.＞3.6m C.≥1.5m D.≤1.5m
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