A.铁丝不能在空气中燃烧,因为引燃的温度不够高 |
B.碳与氧气反应的产物种类与反应体系中碳和氧气的质量比有关 |
C.通常在空气中铝比铁耐腐蚀,因为铝的表面生成一层致密的氧化膜 |
D.粉尘爆炸实验中,吹入空气将面粉扬起,是为了增大反应物间的接触面积 |
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