在410~440℃温度范围内,下列说法
A.当乙醇进料量一定,随乙醇转化率增大,乙烯选择性升高 |
B.当乙醇进料量一定,随温度的升高,乙烯选择性不一定增大 |
C.当温度一定,随乙醇进料量增大,乙醇转化率减小 |
D.当温度一定,随乙醇进料量增大,乙烯选择性增大 |
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