"外锁道岔中的BHJ的作用有那些？
["\u7b54\uff1a1.\u8f6c\u8f99\u673a\u7535\u6e90\u63a5\u901a\u65f6\u5438\u8d77\uff0c\u6784\u62101DQJ\u81ea\u95ed\u7535\u8def 2. \u8f6c\u8f99\u673a\u8f6c\u6362\u5230\u4f4d\uff0c\u542f\u52a8\u7535\u8def\u5207\u65ad\u65f6\u843d\u4e0b\uff0c\u7528\u4ee5\u5207\u65ad1DQJ\u81ea\u95ed\u7535\u8def3. \u4e09\u76f8\u7535\u6e90\u65ad\u76f8\u65f6\uff0c\u5207\u65ad1DQJ\u81ea\u95ed\u7535\u8def\uff0c\u7528\u4ee5\u4fdd\u62a4\u7535\u673a \""]