Objective To study and select those medicine which could improve immigrants cardiac index and work-efficiency at high altitude.
目的研究筛选改善高原移居青年心功能提高做功效率的药物。
It was difficult to construct because of large span, lots of high altitude work and short construction period.
由于桁架跨度大、高空作业多、工期短,施工难度较大。
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