(1)已知他家原有用电器的总功率是,从电能表使用的角度考虑,他家的电路
(2)在其他条件相同时,导线的横截面积越大,电阻越
(3)小致洗头发时,热水器将的水从20℃加热到45℃,则水需要吸收的热量为
(4)吹干头发后,用塑料梳子梳头,头发越梳越蓬松,这是与梳子摩擦后的头发带同种电荷而相互
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