A.步骤①倒平板操作时,倒好后应立即将其倒过来放置 |
B.步骤②接种环在火焰上灼烧后迅速沾取菌液进行平板划线,以免空气中的杂菌污染 |
C.步骤③多个方向划线,使接种物逐渐稀释,培养后出现单个菌落 |
D.利用步骤④所采用的方法培养和纯化X细菌的同时可对其进行计数 |
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