单项选择题
A.16°B.19°C.18°D.22°
A.B/24B.B/24+3.4C.B/24+3.6D.B/24+3.9
A.0.3cmB.0.5cmC.0.7cmD.1cm
A.1.5cmB.2cmC.2.5cmD.3cm
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