安装，更换和修复照明灯具和电气控制及配电设备，如开关，继电器和断路器面板。
Install, replace and repair lighting fixtures and electrical control and distribution equipment, such as switches, relays and circuit breaker panels.
介绍了几种实用的灯具开关控制电路，重点说明了各种电路的工作原理和应用。
Introducing several practical switches and control circuits of lamps and lanterns stressing the working principle and practical of several circuit.
开关与灯具控制顺序相对应，风扇的转向及调速开关应正常。
Switch should match sequence of lighting fixture control. Direction turn and speed regulating switch of fan should work well.
开关与灯具控制顺序相对应，风扇的转向及调速开关应正常。
Switch should match sequence of lighting fixture control. Direction turn and speed regulating switch of fan should work well.
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