Digital control and luminous diode...
数码管和发光二极管。
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。
The luminous diode is arranged at the top of the projection, and situated at the focal point of the concave cup structure.
以及发光二极管设置于该支撑底座的顶端，并且该发光二极管位于该凹杯结构的焦点。
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