我国入境旅游的三大市场是_____市场、_____市场、_____市场。
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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
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