鄂尔多斯盆地西北缘奥陶纪凝灰岩锆石U-Pb年龄、Hf同位素特征及地质意义

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Strong people go for help. Ask for assistance. Gnashing your teeth in the dark will not get you extra brownie points. It is a sign of strength to ask for assistance and people will respect you for it.
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