4A理论中（）涉及旅游目的地整体旅游产品内容中的接待设施和相关社会服务。 A: Amennities B: Attitude C: Ancillary service D: Availability

发动机及所有附件使用同一种润滑油。 A: The engine and all auxiliary equipment use the same lubricant. B: The engine and all ancillary equipment use the same lubricant. C: The engine and all backup equipment use the same lubricant.

发动机及所有附件使用同一种润滑油。 A: The engine and all ancillary equipment use the same lubricant. B: The engine and auxiliary power unit use the same lubricant C: The engine and al auxiliary equipment use the same lubricant