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【单选题】
There are a large number of steganographic(2)that most of us are familiar with(especially if you watch a lot of spy movies),ranging from invisible ink and microdots to secreting a hidden message in the second letter of each word of a large body of text and spread spectrum radio communication.With computers and networks,there are many other ways of hiding informations,such as:
A.
methods
B.
software
C.
tools
D.
services
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】If there are economies of scale throughout the relevant output range of production, which is false?
A.
It is a natural monopoly.
B.
It is more efficient to have a single firm produce the good.
C.
It would typically result from a firm's possession of an exclusive patent.
D.
One large firm can produce at lower cost than two or more smaller firms.
【多选题】If there happens a large passenger flow, what may station officers broadcast in the station?
A.
Dear passengers, crowded management plants are now in operation. Please follow the directions to exit the station.
B.
Some entry gates are temporarily shut down. We apologize for any inconvenience this might cause.
C.
The station exit service will be suspended because of the big jam. We apologize for any inconvenience this might cause.
D.
We have informed the fender bus system. Passengers go to the assigned bus waiting place at Exit B, and free buses will be available.