Each position of the selector must be clearly identifiable and must correspond to a single operating or control mode.
该选择器的每一位置必须能清晰识别，并且对应于单一操作或控制模式。
Each position of the selector must be clearly identifiable and must correspond to a single operating or control mode.
该选择器的每一位置必须能清晰识别，并且对应于单一操作或控制模式。
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