菌种 | 菌落直径:C(mm) | 透明圈直径:H(mm) | H/C |
细菌Ⅰ | 5.1 | 11.2 | 2.2 |
细菌Ⅱ | 8.1 | 13.0 | 1.6 |
有关本实验的叙述,
A.培养基除淀粉外还含有氮源等其他营养物质 |
B.筛选分解淀粉的细菌时,菌液应稀释后涂布 |
C.以上两种细菌均不能将淀粉酶分泌至细胞外 |
D.H/C值反映了两种细菌分解淀粉能力的差异 |
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