发现胀轨跑道时必须立即如何做？处置后放行列车有何要求
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防护栅栏的设备管理由（）部门负责，治安管理由铁路公1安1部门负责
WhatisMichael'sproblem？（）
A. He has difficulty in graduating from high school.
B. He wants to go to university but cant afford it.
C. He cant decide on taking a gap year or going to university.
D. He is not sure what major can help him to get a good job
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