Thursday, September 22, 2022
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填空题通信设备用交流电供电时,在通信设备的电源输入端子处测量的电压允许变动范围为:额定电压值的()%~+10%。...
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Thursday, September 15, 2022
()应核对货物装箱清单上的材料名称、规格、型号、数量与设计文件及设备材料购买合同是否一致,若设备或材料有损伤,要进行拍照...
Thursday, September 22, 2022
典型的监控三级网络结构为:监控中心(SC)、监控站(SS)、监控单元()。...
Thursday, September 22, 2022
通信电源和环境集中监控系统按管理要求和空间分布,可分成()、()、监控单元()3个层次。...
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人类对空气调节工程提出了哪些要求?空气调节系统是如何满足这些要求的?...
Thursday, September 22, 2022
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热泵空调中,冷凝器可以当蒸发器使用,蒸发器也可以当冷凝器使用。...
Thursday, September 22, 2022