题目内容 (请给出正确答案)
提问人:网友13***556 发布时间:2023年1月1日 20:37
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调车手信号,指挥机车向显示人方向来的信号,昼间为展开的绿色信号旗在()摇动。

A . A、下部左右

B . B、上部左右

C . C、中部左右

D . D、上下左右

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