A.（u cn/p）m/（u cn/p）a為某種介質(zhì)對(duì)空氣的質(zhì)能吸收系數(shù)之比
B.（u cn/p）m/（u cn/p）a為某種介質(zhì)對(duì)空氣的質(zhì)能吸收本能之比
C.（u cn/p）m/（u cn/p）a為水對(duì)空氣的質(zhì)能阻止本領(lǐng)之比
D.（u cn/p）m/（u cn/p）a為介質(zhì)中吸收劑量與照射質(zhì)量的轉(zhuǎn)換系數(shù)
E.（u cn/p）m/（u cn/p）a為水中吸收劑量與照射劑量的轉(zhuǎn)換系數(shù)