单项选择题
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°
A.纵向 B.横向 C.竖向 D.垂直方向
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