New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »

· · 来源：user资讯

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int left = 2 * i + 1; // 左子节点

* @param n 数组长度

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