A.抛掷一枚质地均匀的硬币,出现正面; |
B.抛掷一枚质地均匀的正方体骰子(六个面分别刻有数字1到6),掷出的点数为奇数; |
C.在一副洗匀的扑克(背面朝上)中任取一张,恰好为方块; |
D.三张同样的纸片,分别写有数字2,3,4,和匀后背面朝上,任取一张恰好为偶数 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2