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Paranasal sinuses can reduce the weight of skull, warm and moist air and resonate with pronunciation
Paranasal sinuses can reduce the weight of skull, warm and moist air and resonate with pronunciation
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 power of gas exchange is gas differential pressure.
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Respiratory frequency can be changed by individual physiological condition, external environment, disease and other factors.