一个有锋利边缘的指示器和带反射弧光灯能够使读数非常清楚，能够避免视觉误差。

Sharp edge of a reflex arc lamp indicator and band can make reading very clear, to avoid the visual errors.

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减少指示误差与指示器的设计。

Method to decrease the indication error and the design of the indicator.

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舵角指示器的误差太大。

The error of the rudder angle indicator is too large.

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