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【多选题】
粗纤维作为营养物质是因为（）A.
体积大，吸水量多，不易消化，可填充胃肠道，使动物食后有饱腹感
B.
粗纤维在瘤胃和盲肠中经微生物发酵产生各种挥发性脂肪酸，以作为反刍动物合成脂肪、葡萄糖及氧化恭能的原料
C.
具有刺激消化道粘膜，促进胃肠道蠕动和粪便的排泄
D.
含有动物体内不可缺少的元素
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