A.眼前50cm,25cmB.眼前50cm,20cmC.眼前40cm,25cmD.眼前40cm,20cm
A.从远点到无限远B.从近点到无限远C.从远点到眼前D.从近点到眼前
A.-1.00DB.-3.00DC.+1.00DD.+2.00D