A.制作黄瓜表层果肉细胞临时装片时,滴加生理盐水以维持细胞形态 |
B.显微镜对光时,需转动反光镜使光线通过光圈、通光孔、物镜和目镜 |
C.观察根毛时先用肉眼观察,找到幼根上的白色“绒毛”,再用放大镜观察 |
D.在“测定某种食物中的能量”实验中,温度计下端要浸入水中,不要接触瓶底 |
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