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(a) 空运，原因是商用直升机租赁费用增加，以及航空燃料单价上涨；
(a) air transportation as a result of increased rental costs for commercial helicopters and the higher unit costs of aviation fuel;
Last Update: 2016-12-04
Usage Frequency: 1
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1.2.4 租赁费用
1.2.4 rent costs
Last Update: 2016-12-04
Usage Frequency: 10
Quality:
