家用电热水壶一般由加热电阻丝(R1)、指示灯(L)、限流电阻(R0)、蒸汽开关(S1)、防干烧开关(S2)组成。当蒸汽开关与防干烧开关都闭合时,指示灯亮,加热电阻丝工作;当蒸汽开关闭合,防干烧开关断开时,指示灯和加热电阻丝都不能工作。以下电路设计最符合设计要求的是( )
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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