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Image From: https://www.nasa.gov/image-feature/artist-s-view-of-a-planet-where-liquid-water-might-exist
[设想图]地外类地行星Proxima b上的液态水
Image From: https://www.nasa.gov/image-feature/artist-s-view-of-a-planet-where-liquid-water-might-exist
作者： 荒原之梦
Image From: https://www.nasa.gov/image-feature/artist-s-view-of-a-planet-where-liquid-water-might-exist
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Image From: https://images.nasa.gov/details-AFRC2020-0089-82
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Image From: https://images.nasa.gov/details-PIA00224
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Image From: https://images.nasa.gov/details-iss063e074252
糖果色的火卫一
Image From: https://www.nasa.gov/image-feature/candy-colored-phobos
SpaceX Crew-1 载人飞行任务乘员徽章
Image From: https://images.nasa.gov/details-jsc2020e026314
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Image Credit: NASA/Frank Michaux
Image From: https://images.nasa.gov/details-KSC-20200810-PH-FMX01_0011
[设想图] NASA 重返月球
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Image From: https://www.nasa.gov/feature/nasa-perseveres-through-pandemic-looks-ahead-in-2020-2021
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Image From: https://www.nasa.gov/feature/jpl/nasas-ingenuity-mars-helicopter-recharges-its-batteries-in-flight
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2011年考研数二第04题解析
题目
微分方程 $y^{”} – \lambda^{2}y = e^{\lambda x} + e^{- \lambda x} (\lambda > 0)$ 的特解形式为 $?$
$$
A. a (e^{\lambda x} + e^{- \lambda x})
$$
$$
B. ax (e^{\lambda x} + e^{- \lambda x})
$$
$$
C. x (ae^{\lambda x} + be^{- \lambda x})
$$
$$
D. x^{2} (ae^{\lambda x} + be^{- \lambda x})
$$