A.“练习使用显微镜”,物镜低倍换高倍后,为使图像更清晰,微调粗准焦螺旋 |
B.“制作和观察洋葱内表皮细胞临时装片”,滴加碘液能更清楚的观察叶绿体 |
C.“探究温度和湿度对霉菌生长的影响”,面包片在空气中暴露20-30分钟,使霉菌的孢子落到面包片上 |
D.“双缩脲检测蛋白质”,现象是与稀释蛋清液呈褪色反应 |
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