Click the Exhibit button. Given the following parameters: transmitter output (min): -2 dBm receiver input (min): -28 dBm 15216 Mux and Demux loss: 4.5 dB 16 channels maximum In which sites shown in the exhibit could the 15216 EDFAs be placed to minimize the number of EDFAs needed?() Locations B, C only。 Locations A, B, C only。 Locations A, B, D only。 Locations B, C, D only。 Locations A, B, C, D。
按GB5071-1996《液压电梯》规定,直顶式液压电梯的多级液压缸,各级的导向长度应不小于相应柱塞外径的()倍。 1.5。 2。 2.5。
电容器应能在()倍过电流的情况下()工作,电容器回路电气设备的()也是按()倍的过电流考虑的。
馈线入室处必须有回水弯,回水弯的底部与入室埠的水平高度要除以低于()厘米。 10。 12。 8。 9。
You deploy Windows 7 and several custom Internet Explorer add-ons to 1,000 client computers. Internet Explorer closes when users run a specific Web application. You need to find out whether an add-on is the cause of the problem. What should you do?() Start Internet Explorer in No Add-ons mode.。 Reset all Internet Explorer security zones to the default levels.。 Use Group Policy to turn on Internet Explorer 7 Standards mode.。 Use Group Policy to disable the Programs tab in Internet Explorer for all client computers.。
对轻、中度抑郁发作治疗,一般首选()