皮皮学，免费搜题
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【单选题】
调车色灯信号机显示( )灯光,表示允许越过该信号机调车。A.
一个蓝色
B.
一个月白色
C.
一个月白色闪光
D.
一个红色
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】A．Because they lack self-discipline in their studies. B．Because they spend too much time on the Internet. C．Because they have not exerted their utmost. D．Because they have developed poor relationships...
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