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}订阅一组标的的实时行情推送,订阅成功后立即推送已有缓存行情
退订一组标的的实时行情推送
subscribe / unsubscribe 操作的响应,返回当前完整订阅列表
实时行情数据,仅包含已订阅且有更新的标的
操作失败时返回的错误信息