(71) is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74) is a device used to connect two separate network that use different communication protocol.
(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．NNI

B．NRZ

C．NAK

D．NVT

汉武帝确立儒学正统地位的措施不包括（）

A.官方思想方面：罢黜百家，确立儒学独尊的正统地位

B.官方教育方面：兴办太学，使儒学教育官方化和制度化

C.官员选拔方面：儒生入仕，加强了儒学政治文化影响

D.科技考试方面：考试选官，以儒学经典作为考试内容