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段落翻译（手写拍照上传）：Surveying has been traditionally defined as the art and science of determining the position of natural and artificial features on, above or below the earth’s surface; and representing this information in analog form as a contoured map, paper plan or chart, or as figures in report tables, or in digital form as a three dimensional mathematical model stored in the computer.

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段落翻译（手写拍照上传）：Therefore, distances measured on or near the surface of the earth are not along straight lines or planes, but on a curved surface. Hence, in the computation of distances in geodetic surveys, allowances are made for the earth’s minor and major diameters from which a spheroid of reference is developed.

段落翻译（手写拍照上传）：The ordinary procedure in determining elevations, such as balancing backsight and foresight distance in differential leveling, automatically takes into account the curvature of the earth and compensates for earth curvature and refraction, and elevations referred to the curved surface of reference are secured without extra effort by the surveyor.

关于数据库以下表述正确的是

A. 数据库是独立于应用程序的数据集合。
B. Oracle，SQL Server和MySQL都是关系型数据库。
C. 关系数据库的理论模型是比尔恩门提出的。
D. NoSQL数据库的数据存储格式可以是松散的，支持Join操作并且易于横向扩展。

组成人体蛋白质氨基酸共有_____种，其中，有_种是人体不能自身合成的或合成数量较少的，称为__________。