For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （） 0.4 nanometers。 0.6 nanometers。 0.8 nanometers。 1.2 nanometers。 1.6 nanometer。
气体润滑
要编写高质量的程序，判断程序质量的首要标准是程序的（），要保证程序在多次反复使用过程中不发生错误，应该保证程序的（）。
把宗教、哲学、艺术、道德称为文化，把科学技术创造的物质成果称为“浅薄的文明”的观点出自（） 德国部分古典哲学家。 马林诺夫斯基。 克罗伯。 傅立叶。
Why would the network manager elect to implement a configuration that includes GRE tunnels for a eleworker deployment?（） GRE can use transport mode and save up to twenty bytes per packet.。 The corporate network includes many discontinuous blocks of IP networks and requires split tunneling.。 The corporation's primary application is based on IP multicast.。 Without GRE, there is no means to detect a head-end failure.。 GRE would enable path MTU discovery.。
If node 2 is accepting line timing from node 1, node 2 will send （）to node 1 as its SSM message.
