DOU Xiao-juan. Study of the influence of rare earth and manganese on the pitting resistance of hot-dipped aluminum plating[D]. Shenyang:Northeast University, 2010.

[6] 窦晓娟。 稀土和锰对热浸镀铝层抗腐蚀性能影响的研究[D]。 沈阳：东北大学，2010。

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I'd had almost no time to prepare for my trip, so I landed in San Juan at midnight with only one contact.

NPR: Grief, and Warmth, Among Soldiers' Families in Puerto Rico