We consider the degeneracy of holomorphic curve f from C to a complex nonsingular projective variety X of dimension 3.

First,we use a different way from Bolton to prove that a holomorphic curve from S2 into CPn is uniquely determined by its induced metric,up to a rigid motion.

In this article holomorphic curves in the complex hyperbolic space are discussed.

Eremenko’s Picard-type theorem,we obtain Julia direction existence theorems for holomorphic curves in related to algebraic hypersurfaces located in general position;And an example is given to illustrate our results.

To the problems of the slope of the early period on log-log plot is more than 1 and the data of the middle period and late period is too discrete which makes the early period of theoretical curve can not be matched and too discrete middle and later data makes too difficult for interpreters to make acute analysis.

Then the time domain and frequency domain theoretical curves of the longitudinal vibration velocity of the pile head are calculated when there appears necking or fracture in the upper part of the pile.

By analyzing the discharge formulas of the seeping of isolated well among the homogeneous isotropic aquifer when the water level at the beginning is in horizontal and fixed state and no water is supplied from up and down of the well,relevant theoretical curves(well flow-functions) have been introduced.