// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
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self.mask = metas["mask"]。关于这个话题，WPS官方版本下载提供了深入分析
承运人知道危险货物的性质并已同意装运的，仍然可以在该项货物对于船舶、人员或者其他货物构成实际危险时，将货物卸下、销毁或者消除危险性，并且不承担赔偿责任。但是，本款规定不影响共同海损的分摊。。快连下载安装对此有专业解读