描述颜色的三种语言是色相、饱和度、色阶。
参考答案：错
Take Mark Twain’s Adventures of Huckleberry Finn as an example to illustrate the statement that Mark Twain was a unique writer in American literature.
细胞外液中主要的阳离子是（）
A.K+
B.Na+
C.Ca2+
D.Mg2+
E.Fe2+
