与鸟类的体温能保持恒定的有关的是a鸟的食量大消化能力强旺盛产生的热量较多b有羽毛的保护c有良好的产热和散热结构d鸟有双重�吸的特性 Template




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tomski与鸟类的体温能保持恒定的有关的是a鸟的食量大消化能力强旺盛产生的热量较多b有羽毛的保护c有良好的产热和散热结构d鸟有双重�吸的特性 coloring