A.甲发现一只老鼠,既害怕又觉得很恶心,就没有记录 |
B.乙发现儿株从未见过的小花,将它们拔起,准备带回学校问老师 |
C.丙拨开草丛,一只蝗虫跳出来蹦到了公园栅栏外,于是将它也记录下来 |
D.丁的调查记录中有蟋蟀,看到其他同学的记录中都没有,于时将它删掉了 |
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