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为了方便,假定我们所研究的定日镜位于坐标系的原点O,锅炉的位置在P_1点(x_1、y_1z_1)(图1)。设OP_1的方向余弦为
For convenience, it is assumed that the heliostat we studied is located at the origin O of the coordinate system and the boiler position is at P_1 (x_1, y_1z_1) (Fig. 1). Let OP_1 be the direction cosine