单项选择题
A.一、三B.一、四C.二、三D.一、二
A.255°B.265°C.275°D.285°
A.0.5~0.6B.0.5~0.7C.0.5~0.8D.0.5~0.9
A.0.65~0.70B.0.65~0.75C.0.65~0.80D.0.65~0.85
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