()在鱼体内不能合成,必须由饲料提供,缺乏它会引起鱼代谢紊乱、营养障碍、生长停滞、体 发布时间:2019-07-14 00:26 │ 来源:www.tikuol.com 题型:单项选择题 问题: ()在鱼体内不能合成,必须由饲料提供,缺乏它会引起鱼代谢紊乱、营养障碍、生长停滞、体弱多病。A.脂肪B.必需脂肪酸C.蛋白质D.非必须脂肪酸
题型:单项选择题 The hospital________well,where many wounded________every day.[ ]A.is operated;operation B.operates;are operated onC.operates;are operated D.operates;operates on 查看答案
题型:单项选择题 ______ he is very young,_____ he knows much.[ ]A.Although;but B.Although;\ C.\;because D.As;\ 查看答案