通过使用个人保护装置以及噪音控制工程，减少接触噪音时间。
reducing exposure (both occupational and recreational) to loud noises by using personal protective devices and by engineering noise control.
该保护电路与传统的保护电路相比，不仅无需考虑交流接触器的热稳定性，还省去了热继电器、交流接触器等保护装置的耗能。
Comparing this protective circuit with conventional protective circuit, it has advantages of independent from thermal stability of ac contactor, save energy consumption of the...
该保护电路与传统的保护电路相比，不仅无需考虑交流接触器的热稳定性，还省去了热继电器、交流接触器等保护装置的耗能。
Comparing this protective circuit with conventional protective circuit, it has advantages of independent from thermal stability of ac contactor, save energy consumption of the...
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