A.调查表:你每天上几节体育课?(在□里画“√”) 没有□ 1节□ 2节□ 1节或2节□ |
B.调查表: 你在家会运动吗?(在□里画“√”) 经常会□ 偶尔会□ 从来不会□ |
C.调查表:你每天的体育活动有多长时间?(在□里画“√”) 30分以内□ 30-60分□ 60-90分□ 90分以上□ |
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