In some foreign countries, it is more than 20 years since the study on technology for deepsea polymetallic nodule mining has been conducted, and many results have been achieved in this field.
国外在深海多金属结核开采技术研究这一领域中开展研究工作历时20余年，取得了许多成果。
Study on technology for the experimental modal test and parameter identification of the light thin plate retaining wall.
轻型薄板式挡土墙试验模态测试与参数识别技术研究。
Study on technology for the experimental modal test and parameter identification of the light thin plate retaining wall.
轻型薄板式挡土墙试验模态测试与参数识别技术研究。
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