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问题 选择题

The boy made a hole in the door to let his cat______. [ ]

A. in

B. out of

C. to come in

D. to go out

答案

答案：A

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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单项选择题

按五行属性分类，五行化土者是

A．生
B．长
C．化
D．收
E．藏
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