Coronary-Artery
发表于 2025-3-21 16:27:04
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漂白
发表于 2025-3-21 21:54:07
Volker Steinbach,Bernhard Cramer,Jürgen Vastersdiscovered (but not developed) already in late 1960s direct oxidative (dehydrogenative) transition metal-mediated C-C coupling reactions, run via formal double C-H bond activation, which do not require utilisation of substrates activated by halogens.
Intentional
发表于 2025-3-22 01:30:10
Dieter Lohmannhich involves an addition of chlorine to a silicon atom at the first stage, and then removal of chlorine during the process of producing silicones. It has been shown that eliminating the need for chlorine-containing compounds in this sector is very challenging, but achievable.
harmony
发表于 2025-3-22 04:43:36
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地牢
发表于 2025-3-22 10:14:58
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Psychogenic
发表于 2025-3-22 16:26:15
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Distribution
发表于 2025-3-22 19:09:24
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厚颜无耻
发表于 2025-3-22 21:47:18
Nadja Podbregarcollected by worksheets and interviews. The absorption spectra of cellophane were also recorded to account for the principle of color formation of matter. Three science concepts and seven alternative concepts that students possessed were discovered. A system of “reasoning equations” was developed to
讨人喜欢
发表于 2025-3-23 02:59:12
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共同时代
发表于 2025-3-23 06:53:45
Brian Horsfield,Hans-Martin Schulz,Dieter Lohmannir lecture course. They were asked to “Draw a picture of you as a science teacher at work” and to “Answer the questions at the bottom of the page to further explain the picture.” The four open-ended questions asked the students to describe the depicted instructional situation, the activity of the st