在纵向关系中，上下游企业的双重加价不会造成效率损失。()
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搭配销售是一种纵向价格约束。()
A. 正确
B. 错误
A．visitorsB．ownersC．waitersD．guests
A. visitors
B. owners
C. waiters
D. guests
What is the meaning of the word "waterproof" in the fourth paragraph？
A. Covered with water.
B. Full of water.
Cleaned by water.
D. Not allowing water to go through.
A．whenB．beforeC．afterD．while
A. when
B. before
C. after
D. while
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