单项选择题
A.1-1.5mm B.2-3mm C.3-4mm D.4-5mm
A.314.2mm B.78.55mm C.7855mm D.1964mm
A.2R B.3R C.1.57R D.3.14R
A.1°-2° B.2°-4° C.3°-5° D.4°-6°
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