By the early 1950s, business people began to realize______.
A. the importance of efficient production
B. the necessity of extensive promotion
C. the need to try to change customers" needs
D. the significance of knowing customers" needs
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脑疝形成的机制
A. 颅腔内容物体积增大
B. 颅内血容量增加
C. 颅内脑脊液增加
D. 颅内压力分布不均匀
E. 颅内占位性病变
_____是以“旅游让城市生活更美好”为主旨的国际旅游组织。
我国公民的出境旅游包括_____旅游、_____旅游、_____旅游。
_____旅游不受季节影响且消费水平高和出访频率高
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