1.他制作生态瓶正确的操作顺序是( )。
A.去盖→铺沙装水→放鱼虾→种水草 |
B.去盖→种水草→铺沙装水→放鱼虾 |
C.去盖→铺沙装水→种水草→放鱼虾 |
A.水草 |
B.鱼虾 |
C.泥沙 |
A.海洋 |
B.森林 |
C.池塘 |
A.沙 |
B.水草 |
C.水 |
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