纸条上四种色素的排列顺序正确的是()①叶绿素a②叶绿素b③胡萝卜素④叶黄素
A.①②③④
B.③④①②
C.②①③④
D.④③①②
参考答案:B
原发性痛风最主要的发病机制为
A.磷酸核糖焦磷酸合成酶活性增强B.次黄嘌呤-鸟嘌呤磷酸核糖转移酶缺乏C.胰岛素抵抗D.尿酸排泄减少E.尿酸生成增多
Since it was so difficult for American Indians to negotiate a peace treaty or declare war in their native language, they used a universal understood form of sign language.