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【单选题】
已知a>b>0,椭圆 x 2 a 2 + y 2 b 2 =1 ,双曲线 x 2 a 2 - y 2 b 2 =1 和抛物线ax 2 +by=0的离心率分别为e 1 ,e 2 和e 3 ,则下列关系不正确的是(  )
A.
e 1 2 +e 2 2 <2e 3 2
B.
e 1 e 2 <e 3
C.
e 1 e 2 >e 3
D.
e 2 2 -e 1 2 >2e 3 2
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参考答案:
举一反三
【单选题】In the book "Autobiography of Values", the aviation hero Charles Lindbergh reveals his paradoxical and often sobering thoughts on life.
A.
contradictory
B.
poignant
C.
mystic
D.
paramount
【单选题】关于帧和帧速率叙述错误的是?
A.
电影的帧速率为24fps。
B.
动画中的每一个单独图像称之为一帧。
C.
帧为3ds Max中时间的最小单位。
D.
动画中每秒显示的图片数为帧速率,单位为fps。
【单选题】关于帧和帧速率,以下叙述错误的是()?
A.
电影的帧速率为24fps
B.
动画中的每一个单独图像称之为一帧
C.
帧为3dsMax中时间的最小单位
D.
动画中每秒显示的图片数为帧速率,单位为fps
【简答题】A. Lindbergh used this additional training to get a job as an airmail pilot, flying out of St. Louis, Missouri. B. Working with an aviation company from San Diego, California,and with financial help f...
【简答题】One of the most famous scientists to study adaptations (适应能力) was Charles Darwin (达尔文). He was born in England in 1809. He wasn't the best student in his school, but when he was 16, his father sent hi...
【单选题】关于帧和帧速率叙述错误的是?
A.
电影的帧速率为24fps。
B.
动画中的每一个单独图像称之为一帧。
C.
帧为3dsMax中时间的最小单位。
D.
动画中每秒显示的图片数为帧速率,单位为fps。
【单选题】关于帧和帧速率叙述错误的是()。
A.
电影的帧速率为24fps
B.
动画中的每一个单独图像称之为一帧
C.
帧为3dsMax中时间的最小单位
D.
动画中的每秒显示的图片数为帧速率,单位Fps
【判断题】Charles Lindbergh was alone on board during his flight across the Atlantic.
A.
正确
B.
错误
【单选题】After flying across the Atlantic, Charles Lindbergh became famous______.
A.
immediately
B.
overnight
C.
punctually
D.
promptly
【简答题】In the Charles E.Johnson Elementary School in New York, there is a special radio. It gives people warnings(警报)about bad weather. One day, there came a sound from the radio. This sound brought the piec...
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