单项选择题
A.10mm,0.2mmB.8mm,0.4mmC.8mm,0.2mmD.6mm,0.1mm
A.16倍B.10倍C.25倍D.20倍
A.宽光照射B.窄光照射C.圆锥光束照射D.正切法E.滤光照明