问题
单项选择题
雷达管制尾流标准适用于跟进航空器同高度时，或当跟进航空器在先行航空器下方垂直间隔小于下述哪一高度飞行时采用？（）
A.1000m
B.500m
C.600m
D.300m
答案
参考答案：D
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雷达管制尾流标准适用于跟进航空器同高度时，或当跟进航空器在先行航空器下方垂直间隔小于下述哪一高度飞行时采用？（）
A.1000m
B.500m
C.600m
D.300m
参考答案：D
We come by business naturally in our family.Each of the seven children in our family worked in our father’s store.As we worked and watched，we ____ that work was about more than ____ and making a sale. One lesson stands out in my mind.It was shortly before Christmas.I was in eighth grade and was working evenings，straightening the toy section.A little boy，five or six years old，came in.He was wearing a brown torn coat with ____ sleeves.His shoes were scuffed(磨损) and his one shoelace was torn.The little boy looked poor to me—too poor to ____ to buy anything.He looked around the toy section，picked up this item and that，and ____ put them back in their place. Dad came down the stairs and walked over to the boy.His steel blue eyes ____ and the dimple(酒窝) in his cheek stood out as he ____ the boy what he could do for him.The boy said he was looking for a Christmas ___ for his brother.I was impressed that Dad treated him with the same ____ as any adult.Dad told him to take his ___ and look around.He did. After about 20 minutes，the little boy picked up a toy plane，walked up to my dad and said, “How much for this，Mister？” “How much you ____？” Dad asked. The little boy held out his hand and ___ it.His hand was creased(起皱) with ____ lines of dirt from holding his ____ too tightly.In his hand lay only 27 cents.The ____ on the toy plane he’d ____ was $3.98. “That’ll just ___ it，” Dad said as he made the sale.Dad’s reply still ____ in my ears.When the little boy walked out of the store，I didn’t notice the worn coat or the ____ torn shoelace.What I saw was a happy child with a ____.
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