兴奋过度
发表于 2025-3-28 15:43:24
https://doi.org/10.1007/978-981-16-3180-11904. However, the invention by Hülsmeyer was not accepted, being the environment not yet ready and lacking a definite operational requirement such as the Air defense, whose need would arise only in the 1930s. Therefore, in spite of being, after all, an happy and possibly a lucky person, Hülsmeyer i
玛瑙
发表于 2025-3-28 19:24:44
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LATHE
发表于 2025-3-28 23:37:27
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稀释前
发表于 2025-3-29 03:43:21
https://doi.org/10.1007/978-981-16-4111-4bombers, whose destructive capability greatly improved in the 1920s and 1930s, when many nations put in service acoustic detection means. The effectiveness of such “aerophones” or “sound mirrors” was limited due to their inherent limitations, and they were promptly abandoned in favour of the emergin