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单透镜系统中频谱是物函数的准确傅立叶变换。
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低通滤波器可实现对比度反转，边沿增强。
商品结构优化的核心思想是( )
____ says: "More and more mankind will discover that we have to turn to poetry to interpret life for us, to console us, to sustain us. Without poetry, our science will appear incomplete; and most of what now passes with us for religion and philosophy will be replaced by poetry."
Tennyson's poem____ is a story of a princess who cannot look at the world except through a reflection in a mirror. As Sir Lancelot rides by the tower where she must stay, she looks at him, and the curse comes to term; she dies after she places herself in a small boat and floats down the river to Camelot, her name written on the boat's stern.
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