女性该如何选择护理液 微微健康
Abstract By using of the mean difference，difference rate of average，standard deviation and correlation analysis methods，the statistics and parative analysis for manual and automatic visibility observation data at Changsha National Basic Meteorological station were carried e conclusion was obtained as follows：Generally，the manual observation result value was greater than the automatic e difference value，deviation-rate，standard deviation of the difference value increased with the visibility e correlation of manual and automatic observation data at Section Ⅴ（VV≥10 000 m）was 0.834，at Section Ⅱ（1 000 m≤VV