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倒台阶式回采--仰挖台阶式回采
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up-over bench stoping
仰挖台阶式回采；倒台阶式回采
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Research in Islam
科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。
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