流眼泪 发表于 2025-3-25 06:28:35
Business Calls for Educational Improvements,ton’s business leaders in the 1970s to reverse the tide and make schools respond to the needs of children, parents, and employers? Was the desegregation suit a detriment, or stimulus to corporate participation and voice?bizarre 发表于 2025-3-25 09:05:24
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Reforming Boston Schools, 1930–2006978-0-230-61109-2Series ISSN 2946-241X Series E-ISSN 2946-2428运动吧 发表于 2025-3-26 07:11:02
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processes, allowing the generation of new colors. Such processes include second-harmonic generation, sum-frequency generation, parametric oscillation and amplification, and continuum generation. However, there is yet another route for generating new frequencies, which relies on a quite different app现代 发表于 2025-3-26 14:26:57
Joseph Marr Croninlasers in the 1960s, the development of dye lasers brought the pulse width down from picoseconds to femtoseconds. The breakthrough in solid state laser pulse generation provided the current reliable table-top laser systems capable of average power of about 1 watt, and peak power density of easily wa考古学 发表于 2025-3-26 20:00:36
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