A.演講者放映(全屏幕)B.在展臺(tái)瀏覽(窗口)C.在課堂放映(窗口)D.觀眾自行瀏覽(全屏幕)
A.三個(gè)B.四個(gè)C.五個(gè)D.六個(gè)
A.函數(shù)求和B.對(duì)數(shù)據(jù)項(xiàng)求商C.函數(shù)求積D.函數(shù)求差