(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(57) 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.
(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.
(59) is a device used to connect two separate network that use different communication protocol.
(60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
The typical conversation between Americans takes a form that is quick and witty. No one speaks for very long. Speakers take turns frequently, often after only a few sentences have been spoken. "Watching a conversation between two Americans is like watching a table tennis game," a German observer said. "Your head goes back and forth and back and forth so fast it makes your neck hurt."
Americans tend to be impatient with people who take long turns. Such people are said to "talk too much." Many Americans have difficulty paying attention to someone who speaks more than a few sentences at a time, as Nigerians, Arabs, and some others do. Americans value conciseness, or what they call "getting to the point."
Americans engage in little ritual interaction (礼节式的互致问候). Only a few ritual greetings are common: "How are you" "I’m fine, thank you," "Nice to meet you," and "Hope to see you again.&quo
A. Americans enjoy talking as well as watching table tennis games
B. Americans like to take short turns in a conversation.
C. Americans get excited easily in a conversation
D. Americans talk with great emotion
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