Make related check and comparison for related suppliers focusing on price, service and delivery length and keep the purchase price during reasonable scale.

在公司重要设备采购、项目工程以及其他高额支出项目上对服务供应商按照上述原则进行比对和选择。

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Also, varying allotted length of stay is more efficient because workers would be able to purchase visas based on their prospective length of work opportunities, and the system would not benefit one job over an alternative with a different time frame.

FORBES: Why Market Based Immigration is America's Best Bet