松软
发表于 2025-3-23 11:44:54
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Rct393
发表于 2025-3-23 14:33:57
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赏钱
发表于 2025-3-23 21:09:04
Earlier Fresnel Lenses,Refraction occurs when a ray passes through surfaces separating materials with different indices of refraction. The contour of these surfaces define the focusing properties of the optical element. The bulk of material between the refracting surfaces has little effect on the optics of the lens.
Indicative
发表于 2025-3-23 23:57:41
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群居动物
发表于 2025-3-24 02:54:59
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Cumulus
发表于 2025-3-24 08:22:53
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预知
发表于 2025-3-24 11:28:44
Solar Thermal Concentrator Systems,Nonimaging Fresnel lenses can only concentrate the direct fraction of solar radiation. Solar resource assessments are necessary to evaluate the suitability of locations for the installation of solar concentrating collectors and to estimate their potential for energy conversion.
CON
发表于 2025-3-24 14:59:26
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Factual
发表于 2025-3-24 22:29:17
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放肆的你
发表于 2025-3-25 01:18:27
teaching ideas that readers can directly incorporate into thThis edited volume supports implementation of a critical literacy of popular culture for new times. It explores popular and media texts that are meaningful to youth and their lives. It questions how these texts position youth as literate so