A.隨管電壓增大而加大 B.與被照體厚度有關(guān) C.照射野大,散射線多 D.主要來源于康普頓效應(yīng) E.對(duì)照片密度對(duì)比度無影響
A.1 B.2 C.3 D.4 E.5
A.0.2mm B.0.25mm C.0.3mm D.0.5mm E.0.05mm