对于比较干燥而触电危险较大的环境,我国规定安全电压为36V。()
A. 正确
B. 错误
高压熔断器过热,现象为变色、温升异常,下列处理原则正确的是()。
A. 不同相别温差过大,更换过热相的高压熔断器
B. 电容器喷射式熔断器温度超过45℃需更换
C. 额定温升超过说明书规定值时需更换
D. 若更换后过热现象未消除,检查连接处是否接触不良,通知专业班组检查被保护设备
What are two important considerations when using 2- or 4-channel 15216 OADMs?() (Choose two.)
All "Add" channels require uniform power levels.
B. The flexibility of wavelengths per OADM is limited.
C. It is easier to balance "Pass-Through" and "Add" channels.
D. There is lower pass-through loss using multi-channel OADMs.
E. You can extract a single channel without dropping other channels.
同一跨内相邻吊弦处的导高差应符合设计预留弛度的要求,施工偏差不得大于()。
A. 10mm
B. 5mm
C. 15mm
D. 20mm