SS4G电力机车在辅助绕组短路或其他原因造成辅助电路短路。其电流超过2800A时,282KC吸合动作使机车自动降弓,并显示辅助过流信号。
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超静定问题的主要特点是其未知量的个数多于系统独立平衡方程的个数,所以未知量不能由平衡方程式全部求出。( )
A. 对
B. 错
短通话
A. 1200m.
B. 2010m.
C. 2100m.
D. 1500m.
短通话
A. He approves the pilot's request.
B. He asks the pilot to stand by.
C. He can not hear the pilot well.
D. He is checking the data the pilot need.
短通话
A. Tyre blows out.
B. Runway lighting is inoperative.
C. Vehicle on the runway.
D. Bird strike.