Ag2S 的溶度积常数表达式正确的是 A.
Ksp＝[Ag+][S2-]        B.
Ksp＝[Ag+][S2-]2　　 C.
Ksp＝[Ag+]2[S2-]      D.
Ksp＝[2Ag+]2[S2-]2

单项选择题色彩在客观上是对人们的一种刺激和象征；在主观上又是一种反应与行为。（ ）

单项选择题What is the serving order in Chinese dinner table? A、From soups to meat dishes, then vegetable plates, cold dishes, pastries and the last fruit B、From cold dishes to meat dishes, then vegetable plates, soups, pastries and the last fruit C、From cold dishes to meat dishes, then fruit, vegetable plates, soups and the last pastries D、From soups to cold dishes, then vegetable plates, meat dishes, fruit and the last pastries