单选题

If the aircraft is parked on a slope, make sure that wheel chocks are in position

AIf the parking apron is not level, make sure the wheel chocks set correctly

BWhen the aircraft parked on a slope, must set parking brake

CIf the aircraft is parked on a slope, set the chocks on main wheel immediately

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正确答案：A （备注：此答案有误）

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If the aircraft is parked on a slope, make sure that wheel chocks are in position

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