1、
2、
They could close passenger and branch lines, as long as they preserved access for Amtrak services.
只要他们能保证美铁运输服务质量,他们可以停运某趟列车或者某条线路上的列车.
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3、
Main products to require: branch exchange, concentrator, lines etc.
所需的主要网络产品: 交换机, 集线器, 超五类线等.
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