A.文艺演出时舞台上经常释放“白气”,这是干冰在常温下的升华现象 |
B.夏天从冰箱里取出的冰棍周围冒“白气”,这是空气中水蒸气凝华的现象 |
C.深秋清晨的河面上经常出现“白气”,这是河面上水蒸气汽化的现象 |
D.冬天水烧开后壶嘴处喷出“白气”,这是壶嘴喷出水蒸气液化的现象 |
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