发电厂或者220千伏以上变电站因安全故障造成全厂（站）对外停电，导致周边电压监视控制点电压低于调度机构规定的电压曲线值5%以上10%以下并且持续时间2小时以上，属于（）。

A、重大事故 

B、较大事故 

C、一般事故 

I have steerage way.It is said that（）.

A.I am underway

B.I am out of control

C.I am not making way through the water

D.I have the amout of movement forward which the ship need to be steered properly