问答题设集合M={1,2,3,4,5),N={2,4,6),则M∩N= 【 】A. {2,4}B. {2,4,6}C. {1,3,5}D. {1,2,3,4,5,6}
问答题函数的最小正周期是【 】A. 8πB. 4πC. 2πD.