accuracy degree
2.Under stereoscope the deviation of L_E from the actual working length and degree of accuracy were determined. Results:The average deviation of the measurements obtained by Tri Auto ZX was significantly lower than that by JustyⅡat reading"0.5"(P<0.01),and the accuracy degree of Tri Auto ZX was remarkably higher than that of JustyⅡ at reading "0.5"(P<0.01).
6.The paper makes use of linear regressive model, grey prediction model and combined forecasting methods to predict the quality cost of engineering project, analyses the superiority and inferiority of every method. Due to the theoretical defect of grey prediction formula, the paper modifies the previous formula, proposes new formula, and improves the prediction accuracy at a certain degree .
8.DETERMINING THE NECESSARY ACCURACY OF SAFETY MONITORING IN ACCORDANCE WITH SAFETY DEGREE FOR STRUCTURAL STRENGTH

