HXD3D型电力机车在微机显示屏的列车信息界面，按压“控制”图标进入控制界面，点击“受电弓预选择”图标，进行受电弓升弓选择。
查看答案
HXD3D型电力机车运行途中，受电弓非正常降下跳主断要立即停车，检查弓网状态。
A. 对
B. 错
HXD3D型电力机车合主断前确认司机控制器调速手柄处于“0”位
A. 对
B. 错
HXD3D型电力机车自动过分相后主断合不上，可采用手动合主断。
A. 对
B. 错
What is the possible reason for the use a question mark in the title?(5.0)
A. The author actually asked the reader this question and expected an answer.
B. The author doubted that his school days was the best years of his life.
C. The author tried to arouse the reader's interest in the topic.
D. It's a rhetorical question.
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