问题
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A. essentialB. availableC. reliableD. responsible
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下列哪项不属于单胺类神经递质A、5-HTB、NEC、AChD、肾上腺素E、多巴胺
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饲料中真正能够被动物利用的能量是().A.GEB.NEC.DED.ME
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【C2】A.essentialB.elementaryC.necessaryD.principal
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A healthy diet is______for maintaining good overall health.A.essentialB.potentialC.regular
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He seemed to feel the() of some explanation.A.essentialB.wishC.necessityD.necessary