(1)对的画“√”,错的画“×”.
①用8个小正方体就能拼成一个大正方体.
②乒乓球、足球、篮球的形状都是球.
③一张复印纸是长方体.
④老师用的粉笔是圆柱形的.
(2)判断下图中哪些是长方体,哪些不是(是画“√”,不是画“×”).
(3)判断下图中哪些是正方体,哪些不是(是画“√”,不是画“×”).
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