(1)黄铜和纯铜,硬度较小的是
(2)生活中的铝制品都很耐腐蚀,原因是
(3)某工厂废液中含有硝酸银、硝酸铜,取一定量的该废液样品,加入一定量的锌,充分反应后得到滤液和滤渣,请回答下列问题:
①若滤渣中有Zn,则滤渣中除有Zn外,还一定含有
②若滤渣中有Cu,则滤液中的溶质一定含有
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