线岔始触区
["\u7ebf\u5c94\u4e24\u5de5\u4f5c\u652f\u4e2d\uff0c\u4efb\u4e00\u5de5\u4f5c\u652f\u7684\u5782\u76f4\u6295\u5f71\u8ddd\u53e6\u4e00\u80a1\u9053\u7ebf\u8def\u4e2d\u5fc3600~1050mm\u7684\u8303\u56f4\u5185\uff0c\u4e0d\u5f97\u5b89\u88c5\u4efb\u4f55\u7ebf\u5939\u3002"]