核酸分子中百分比含量相对恒定的~元素是A.碳( B.氢( C.氧( D.氮( E.磷 发布时间:2017-06-28 16:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 核酸分子中百分比含量相对恒定的~元素是A.碳(B.氢(C.氧(D.氮(E.磷(
题型:单项选择题 Jack is late again.It is of him to keep others waiting. A.normalB.typicalC.commonD.ordinary 查看答案