本系统属于主动型报警系统，由光电二极管、发光二极管、放大电路及报警电路组成。
This type of system is active warning systems from photodiode, luminous diode, the circuit and was enlarged circuit.
本系统属于主动型报警系统，由光电二极管、发光二极管、放大电路及报警电路组成。
This type of system is active warning systems from photodiode, luminous diode, the circuit and was enlarged circuit.
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