A.“探究光对鼠妇生活的影响”时,应设置明亮干燥和阴暗潮湿作对照 |
B.“制作口腔上皮细胞临时装片”时,应先在载玻片上滴一滴清水 |
C.“探究花生果实大小的变异”时,大、小花生各随机抽取30粒 |
D.“嫁接”实验时,要注意接穗和砧木的韧皮部紧密结合 |
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