Under certain conditions, it obtaines the exact estimate of the order and the convergence of zeros of the solutions of the equations. 在一定條件下，得到了其解的級及零點收斂指數的精確估計。
In order to improve the gradation and the quality of the filtering material, both sieved and blasted materials are used.And the quantity of gravel mined decreased. 根據料場砂礫石級配特點和反濾設計要求，綜合利用篩分料和爆破料改善反濾料的級配，進而提高反濾料的質量，同時減少反濾料的開採量。
