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The digestive system of pigs consists of the digestive tract and digestive .
The digestive system of pigs consists of the digestive tract and digestive .
正确答案：glands
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动物解剖生理
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The smooth muscle of digestive tract can form many kinds of movements, mainly including tense , peristalsis, segmental movement and swing.
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The concave edge of the stomach is called the lesser curvature, the convex edge called the curvature.