题型:问答题 简答题 —I think we should give a hand to the elderly when they fall onto the ground.— ___________. Everyone needs help when they are in trouble.A.Sorry, I can’tB.Never mindC. I don’t agreeD.I agree 查看答案
题型:问答题 简答题 市售的“脑黄金”(DHA)是从深海鱼油中提取的,主要成分是一种有机物,其化学式为C25H49COOH,它是由______种元素组成,相对分子质量为______,每个分子中含______个原子. 查看答案