A.在光学显微镜下可以观察到噬体的蛋白质外壳、叶肉细胞的细胞膜 |
B.进行探究实验为减少误差需计算平均值,如探究蚂蚁的通讯、探究慢头在口腔中的变化 |
C.眼看目镜内,逆田时针转动粗准焦螺旋看到物像,再转动细准焦螺旋,使物像更清 |
D.取下洋葱片叶内表皮在清水中展开,滴加稀碘液,使盖玻片一边接触水滴后轻轻放下 |
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