问题描述：
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前向通道增益等于前向通道中各个支路增益的（）
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上一篇：磁感应强度沿任一曲面S的积分称为穿过曲面S的（）。
下一篇：多数紫禁城的宫殿都是木结构，黄琉璃瓦（glazed tile）顶，青白石底座，看上去庄严肃穆，金碧辉煌。 A.Most of the buildings in the Forbidden City were built with wood, roofed with yellow glazed tiles and built on blue-and-white stone foundations, looking solemn and brilliant． B.Most of the buildings in the Forbidden City were built with wood, and people used yellow glazed tiles as the roofs, blue-and-white stones as foundations, so it looked solemn and glittered gold and jade．
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