当钢轨折损严重或断缝大于（）时，应封锁线路进行临时处理。
A. 15mm
B. 30mm
C. 50mm
When evacuating a seaman by helicopter lift，which course should the ship take?（）
A. Downwind so that the apparent wind is close to nil
B. A course that will keep a free flow of air，clear of smoke，over the hoist area
C. A course that will have the hoist area in the lee of the superstructure
D. With the wind dead ahead because the helicopter is more maneuverable when going into the wind
不如实填报个人档案资料，情节较重的，给予（）处分。
A. 警告
B. 严重警告
C. 撤销党内职务
D. 留党察看
中国最早开设《经济学百年》课程的是中国人民大学的李义平老师。
A. 正确
B. 错误
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