, face-sequence and certain-face-sequence, are introduced, and a group of basic decision rules are abstracted according to the characteristics of orthographic projection, the definitions and properties of 2-manifolds, and M?bius rule as well.

By utilizing the characteristic that amplitude correlation between neighbor bins of the same signal is better than different signals, an improved method based on the amplitude correlation between neighbor bins to eliminate the permutation indetermination was proposed.

This paper argues that,for dynamic length measur ing,a sequence measurement model should be built and a sequence-combined standard uncertainty uci should be given so that uncertainty in dynamic length measuring can be expressed.