1.如果丽丽吹气时用弯管进行实验应选择( )瓶。
A.甲 | B.乙 | C.甲和乙都可以 |
A.吹气的瓶子 | B.打气的瓶子 | C.两个瓶子 |
A.烧得更旺 | B.马上熄灭 | C.正常燃烧 |
A.烧杯 | B.酒精灯 | C.吸管 |
A.二氧化碳 | B.氧气 | C.水蒸气 |
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