tical

The critical slope length, distance between shallow gullys and cri-tical runoff converged area are a square function of slope stepness.

且临界坡长、浅沟分布间距和临界汇水面积与坡面平均坡度呈二次曲线关系。

It is shown by prac-tical prediction that the predictions were stable and had higher precision.

实际结果表明:预测结果稳定可靠,具有较高的精度.

This article has described several test methods for contamination resistance of architectural paints, and recommended a couple of test methods showing good relationship with prac tical contamination resistance.

介绍了建筑涂料耐沾污性的几种测试方法，并分别与实际耐沾污性比较，推荐了与实际耐沾污性相关性较好的测试方法。

It is shown that theequation and the amendment to the calculation value is reasonable and prac-tical.

通过比较计算值与实验值的差别,分析误差原因、提出修正计算的办法.

Precise and reliable construction using modern tical equipment.

精确可靠的施工设备使用现代切.

In this paper, the fundamental formulas of oblique and orthographic axonometric projection are deduced by systematically using the analy-tical tracing method. The tangential equation to determine the shaft angles θ_1 and θ_2 in orthographic projection is obtained on this basis.

本文系统的用解析法推导了斜轴测投影和正轴测投影的基本公式的基础上，导出了正轴测投影中确定轴间角Q1和Q2的正切公式。