let p = head; // 遍历链表的指针
"Instead of pulling the oil and gas up from the ground, we're going to inject the CO2 into the ground instead," he says.
curr = curr-next;，详情可参考heLLoword翻译官方下载
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（一）非正常损失的购进货物，以及与之相关的加工修理修配服务和交通运输服务；