Test for sugar with your hydrometer . correct any deficiencies byadding enough sugar to bring the reading up to 22 % ( 22 degrees brix ) 测糖度：用糖度计测定葡萄汁的糖度，如果小于22 ，就要补加到这一数值。
2.
Quantitative tests for sugar content and total acidity of pears were carried out by this system and the relationship between the fruit reflectance and internal quality indices were obtained by using partial least squares calibration techniques 利用该系统对不同采收期雪青梨糖度和总酸度进行了自动检测试验并结合多元校正算法偏最小二乘法，建立了雪青梨漫反射光谱与其内部糖度、酸度的相关关系。
