SESAR旨在建立一个能够满足__________和__________的新一代空中交通管理系统。
A. 未来空域容量
B. 未来空域类型变化
C. 安全需求
D. 出行需求
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SESAR的空中间隔保障系统意义在于,让管制员配备飞行间隔,并优化流量
A. 对
B. 错
One’s ________ are supposed to be as good as his words.
A. acts
B. deeds
C. action
D. behavior
From tomorrow on, a (an) ________ “Save our Earth, save our life” will be carried out throughout the country.
A. activity
B. move
C. campaign
D. event
John, what puts you in such high ________? Any good news?
A. price
B. mood
C. happiness
D. spirits