Secondly, the transfer operator is designed and the judgment method of optimum inquiry standard is given.

其次设计了换乘算子并给出最优查询标准判断方法；

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Eurotunnel's purchase of assets from the former ferry operator Sea France is to face an inquiry over worries the deal could reduce competition and raise fares for cross-Channel travellers.

BBC: Eurotunnel purchase of Sea France ferries faces inquiry