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| A．HNO3(aq)＋NaOH(aq)=NaNO3(aq)＋H2O(aq) ΔH<0 |
B．CH4(g)＋2O2(g) CO2(g)＋2H2O(l) ΔH<0 |
| C．2H2(g)＋O2(g)2H2O(l) ΔH<0 |
| D．2FeCl3(aq)＋Fe(s)=3FeCl2(aq) ΔH<0 |
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
