普速铁路受电弓动态包络线是如何规定的？
["160km\/h \u53ca\u4ee5\u4e0b\u533a\u6bb5\uff0c\u53d7\u7535\u5f13\u52a8\u6001\u62ac\u5347\u91cf 120mm\uff0c\u5de6\u53f3\u6446\u52a8\u91cf 250mm\u3002160km\/h \u4ee5\u4e0a\u533a\u6bb5\uff0c\u53d7\u7535\u5f13\u52a8\u6001\u62ac\u5347\u91cf 120mm\uff0c\u5de6\u53f3\u6446\u52a8\u91cf\u76f4\u7ebf 250mm\uff0c\u66f2\u7ebf 300mm\u3002"]