The main results were summarized as follows: 1. According to injured degree, 28 Masson pine families is divided into five grades.
现将主要研究结果摘要如下：1.28个马尾松家系按其受害的难易程度可分为五类。
The land quality in Xianyang downtown area is divided into five grades, the second grade land is the biggest one, followed by the first, third, fourth and fifth grade of land.
咸阳市区土地质量可分五等，以二等地面积最大，一等地次之，三、四、五等地面积较小。
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