（3）行情持续性与估值判断：化工属于高弹性行业，景气周期来临时弹性远高于大盘，且当前景气向上叠加流动性充裕，长期配置需求旺盛，作为高赔率资产，在风偏高的市场环境下提前兑现部分预期属于正常情况。过往化工行业每轮景气周期基本为两年左右，但判断本轮景气周期或更长，目前尚未到讨论行情高点或卖点的阶段，需待主要产品价格涨至历史高位、盈利处于高水平时再分析是否进入周期中后期，由于周期品价格高度难以准确预测，顺势而为是较为合理的选择。
Debris actually pelts the ISS all the time, and noticeable dents and cracks line the exteriors. But should something fully breach the station, cabin atmosphere will seep into the vacuum of space and alarms will go off. Pressure gauges will confirm to astronauts that the station has, almost certainly, been hit, and the speed of the seepages may indicate how much time the crew has to respond. According to one NASA estimate, a 0.6-centimeter-wide hole leaves 14 hours to plug the leak. A 20-centimeter hole leaves less than a minute.
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