图a
(1)夜晚开窗报警时,V1工作状态处于
(2)夜间开窗后再关窗,V2状态是
(3)报警时,调大R4,则指针式万用表“V档”表盘
(4)把V2与电路断开,用指针式万用表“×10K档”检测V2的正向电阻,红黑表笔连接正确的是
(5)调试电路过程中,小明优化改进该电路,利用三极管自锁电路实现只有按下按钮开关S2才能停止报警。请帮助小明在图b虚线框1中连线,采用
图b
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