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| Should Search and Rescue Operations Be Free of Charge? | |
| 摘 要： | <正>On April 3, 39 teachers and students from the Beijing Institute of Technology (BIT)were trapped on the MaoerMountain in Fangshan District,a suburban area in Beijing. Morethan 300 persons, including |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |