实验物品 | 密度ρ(kg/cm3) |
壹元硬币 | 7.2 |
橡皮 | 1.3 |
塑料 | 0.9 |
泡沫 | 0.l |
蜂蜜 | 2.0 |
水 | 1.0 |
菜油 | 0.8 |
A.塑料、水 |
B.塑料、菜油 |
C.橡皮、水 |
D.橡皮、蜂蜜 |
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