函数 在一个周期内的图象如图1所示,A为图象的最高点.B、C为图象与x轴的交点,且△ABC为正三角形. (1)求ω的值及f(x)的值域; (2)若f(x0)=,且x0∈(-,
在“绿叶中色素的提取和分离”实验中,滤纸条上扩散速度最快的和扩散速度最慢的色素带分别是 A.胡萝卜素、叶黄素 B.叶黄素、叶
—The party will start at 7: 00 sharp. Come earlier. — _____________. A. Good idea B. You’re right C. I think so
最薄的金箔的厚度为0.000000091m,用科学记数法表示为 m
为了研究植物的呼吸作用,小刚设计了如下图所示的装置。请你和小刚一起探究下列问题: (1)实验时,广口瓶用不透光的黑纸包住,其目的是为了防止
Please call my secretary to arrange a meeting this afternoon, or ______ it is convenient to you. A. whenever B. however C. whichever D. wherever
Everyone wants to have a holiday, but you have no idea ____ tiresome it is to rest. A. how B. what C. whether D. no matter how