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问题 单项选择题

Which one of the following is not relevant to the others?（）

A.airport

B.airfield

C.airline

D.air-conditioned

答案

参考答案：D

判断题

承载式车体是将机车车体与底架各自独立的一个钢结构车体。
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(1) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

(2) 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.

(3) 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.

(4) is a device used to connect two separate network that use different communication protocol.

(5) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

2（）

A．RTP

B．RTTP

C．FTP

D．NNTP
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