單項(xiàng)選擇題雙45°探頭對(duì)60km/m鋼軌焊縫進(jìn)行穿透式探傷時(shí),從一個(gè)探頭的入射點(diǎn)到另一個(gè)探頭入射點(diǎn)的距離應(yīng)為()

A.176mm
B.304mm
C.152mm
D.352mm


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