单项选择题
A.48°~55° B.58°~65° C.68°~75° D.78°~85
A.0°~15° B.15°~20° C.20°~25° D.25°~30
A.2mm B.3mm C.4mm D.5mm
A.1~1.5mm B.1.5~2mm C.2~3mm D.3~4mm
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