无人机地面站显示系统应能显示（）信息。
A.无人机飞行员状态
B.飞行器状态及链路、载荷状态
C.飞行空域信息
参考答案：B
Nothing is _____ to defeat you when you often assess yourself negatively.
A．easy
B．more easily
C．much easier
D．the easiest
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