题目内容

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

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A. 1200m.
B. 2010m.
C. 2100m.
D. 1500m.

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.

A. Tyre blows out.
B. Runway lighting is inoperative.
C. Vehicle on the runway.
D. Bird strike.

A. It is unable to hold at C1.
B. Communication broke down.
C. It counld not move at C1.
D. It could not follow the controller.