A.与提取液①相比,②更适合用于检测苹果中的还原糖 |
B.检测还原糖时,应将斐林试剂甲液和乙液等量混合均匀后再加入提取液 |
C.加入斐林试剂的提取液在50~65°C水浴下出现砖红色沉淀,说明一定含有葡萄糖 |
D.实验结束时将剩余的斐林试剂装入棕色瓶,以便长期保存备用 |
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