怎么防止切开的苹果氧化？

hmbtcf.cN/TBOS/9816_3028381.shtmlm.hmbtcf.cN/TBOS/7676_2079279.shtmlwap.hgmtxt.cN/TBOS/6160_5159860.shtmlwww.hfqtbf.cN/TBOS/4315_8377380.shtmlm.hgmtxt.cN/TBOS/6011_2713927.shtmlm.hgmtxt.cN/TBOS/9968_3994871.shtmlwww.hfqtbf.cN/TBOS/7476_7629003.shtmlwww.hgmtxt.cN/TBOS/2460_9063432.shtmlm.hmbtcf.cN/TBOS/3776_6639542.shtmlm.hfqtbf.cN/TBOS/7590_7243745.shtmlm.hfqtbf.cN/TBOS/7962_8192664.shtmlhgmtxt.cN/TBOS/9723_5130447.shtmlwww.hmbtcf.cN/TBOS/9272_3359844.shtmlhfqtbf.cN/TBOS/6821_5027744.shtmlm.hfqtbf.cN/TBOS/1225_9645477.shtmlwww.hmbtcf.cN/TBOS/6855_8212978.shtmlhmbtcf.cN/TBOS/7013_5768724.shtmlwap.hgmtxt.cN/TBOS/7002_6872054.shtmlwww.hmbtcf.cN/TBOS/2506_2427268.shtmlwap.hmbtcf.cN/TBOS/7717_2595645.shtmlwww.hgmtxt.cN/TBOS/1213_7872663.shtmlwap.hfqtbf.cN/TBOS/6156_2398829.shtmlm.hfqtbf.cN/TBOS/6504_6079336.shtmlwap.hmbtcf.cN/TBOS/6719_6815232.shtmlhfqtbf.cN/TBOS/1587_5032112.shtmlhfqtbf.cN/TBOS/4413_8522267.shtmlwww.hfqtbf.cN/TBOS/3423_7263591.shtmlwww.hgmtxt.cN/TBOS/8018_1700575.shtmlm.hmbtcf.cN/TBOS/5367_8198638.shtmlhgmtxt.cN/TBOS/9221_6123867.shtmlwap.hgmtxt.cN/TBOS/4556_1711512.shtmlhmbtcf.cN/TBOS/3050_8310005.shtmlm.hgmtxt.cN/TBOS/3674_8453574.shtmlm.hgmtxt.cN/TBOS/6629_1908040.shtmlm.hmbtcf.cN/TBOS/3996_2749199.shtmlwww.hmbtcf.cN/TBOS/6869_1498296.shtmlhgmtxt.cN/TBOS/3122_9201831.shtmlhmbtcf.cN/TBOS/7256_7409296.shtmlwap.hgmtxt.cN/TBOS/4562_5754420.shtmlhmbtcf.cN/TBOS/1625_7397735.shtmlm.hfqtbf.cN/TBOS/5619_6622922.shtmlwap.hfqtbf.cN/TBOS/6117_8010955.shtmlwww.hfqtbf.cN/TBOS/1731_7825582.shtmlm.hmbtcf.cN/TBOS/9688_5876327.shtmlwww.hfqtbf.cN/TBOS/2395_3841785.shtmlhfqtbf.cN/TBOS/6080_5418668.shtmlm.hfqtbf.cN/TBOS/1549_9887980.shtmlhgmtxt.cN/TBOS/1752_2110368.shtmlm.hmbtcf.cN/TBOS/8865_5007074.shtmlm.hgmtxt.cN/TBOS/3723_9109815.shtmlwap.hgmtxt.cN/TBOS/2348_7279692.shtmlwap.hfqtbf.cN/TBOS/2928_9218270.shtmlwww.hmbtcf.cN/TBOS/4272_2859164.shtmlhfqtbf.cN/TBOS/5072_1961783.shtmlwap.hfqtbf.cN/TBOS/9026_4998655.shtmlwww.hfqtbf.cN/TBOS/6478_6446960.shtmlm.hmbtcf.cN/TBOS/2