A.果酒发酵时,每日放气需迅速,避免空气回流入发酵容器 |
B.果酒发酵时,用斐林试剂检测葡萄汁中还原糖含量变化,砖红色沉淀逐日增多 |
C.果醋发酵时,发酵液产生的气泡量明显少于果酒发酵时 |
D.果醋发酵时,用重铬酸钾测定醋酸含量变化时,溶液灰绿色逐日加深 |
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