滚珠导轨上使用纵向方向。
对每一行的叶轮相互间隔在各自轴纵向方向。
The impellers of each of the rows are mutually spaced in longitudinal direction of the respective shaft.
获取旋转纵向方向以生成横向方向的角度，以度为单位。
Gets the Angle, in degrees, that the portrait orientation is rotated to produce the landscape orientation.
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