以下符合大肠菌杆菌落形态的是（）
A. 蓝黑色，有金属光泽
B. 中心紫黑色，外缘为红色
C. 紫黑色，无金属光泽
D. 中心黑色，外缘为粉色
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
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