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问题 选择题

我们既要埋头拉车，更要抬头看路，眼观六路，耳听八方，从而真正找到方向。这体现了  [     ]

A．机不可失，时不再来

B．适应实际，安于现状

C．敢想敢干，无所不能

D．解放思想，实事求是

答案

答案：D

单项选择题

(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.

A．Router

B．Gateway

C．Bridge

D．hub
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单项选择题

消防水带的技术性能包括：型号、工作压力、（）。

A.公称尺寸

B.公称尺寸和长度

C.长度

D.直径
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