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The negative pressure in the chest is good for the stomach content to retch to the mouth when ruminant.
The negative pressure in the chest is good for the stomach content to retch to the mouth when ruminant.
A.正确
B.错误
正确答案：正确
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动物解剖生理
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The frontal sinuses of cattle are larger and the same as the antrum of the horn process.
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The respiratory rate of cattle is 50-80 times min.