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| 2019, Vol. 56(6): 11-18 DOI: | ||
| Study on the Key Techniques for Improving Working Environment of the Extra-long Highway Tunnels in High Altitude Areas | ||
| (China Railway Southwest Research Institute Co., Ltd., Chengdu 611731; China Railway First Group Co., Ltd., Xi′an 710054) | ||
| Received null Revised null | ||
| Supporting info | ||
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