进行目力检查，确保车辆左右两侧的反光镜是否牢固，是否调整在正确位置。
Visually inspect to ensure that both left and right rear view mirrors are secure and in an acceptable condition.
动平衡机光电头未对正反光纸，光电头镜面模糊，光电头位置偏斜引起角度偏移。
8 balancing head is not opposite photoelectric light paper, photoelectric head mirror, photoelectric position deviation caused by angle.
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