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问题 多项选择题

根据近代世界各国发生通货紧缩的情况分析，通货紧缩的成因有______。

A．货币紧缩

B．资产泡沫破灭

C．币制改革

D．多种结构性因素

E．流动性陷阱

答案

参考答案：A,B,D,E

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．RTP

B．RTTP

C．FTP

D．NNTP
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填空题

对人类社会活动影响较大的生物节律主要是体力、（）和智力。
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