问答题

Basically, there are three types of computers, they are ___.
computer
B、minicomputer
C、microcomputer
D、macrocomputer

A、mainframe.

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The product life cycle includes___.

A、introduction
B、growth
C、maturity
D、decline

单项选择题

The followings are all features of language except __________.

A、duality
B、productivity
C、changeability
D、displacement