旅游真正作为一个行业的重要标志是_____的产生。
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In restructuring the organization, the top-level management should______.
A. include the head of the marketing department
B. support wholeheartedly the implementation of the marketing concept
C. coordinate activities of all departments to ensure market orientation
D. all of the above
我国是世界第一大出境旅游市场和第一大出境旅游_____国。
世界旅游联盟是全球性、综合性、非_____、非_____的世界旅游组织。
代谢性酸中毒的原因是
A. 肠梗阻
B. 低血钾
C. 呼吸道梗阻
D. 换气过度
E. 幽门梗阻