下列有关碱金属元素的性质,从上到下递变规律正确的是 [ ] A.金属性逐渐减弱 发布时间:2017-07-22 16:48 │ 来源:www.tikuol.com 题型:不定项选择题 问题: 下列有关碱金属元素的性质,从上到下递变规律正确的是 [ ]A.金属性逐渐减弱 B.化合价逐渐升高 C.失电子能力逐渐增强 D.最高价氧化物对应的水化物碱性逐渐减弱
题型:不定项选择题 Which of the following describes the rationale for administering vitamin K to every neonate()A. Neonates don’t receive the clotting factor in utero.B. The neonate lacks intestinal flora to make the vitamin.C. It boosts the minimal level of vitamin K found in the neonate.D. The drug prevents the development of phenylketonuria (PKU). 查看答案