单项选择题

A．Enhance the contests of force.
B．Change people’s old mental habits.
C．Change people’s ideologies.
D．Persuade mankind to live with war.
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单项选择题
A．They don’t need conventional signs and symbols.B．They only require a receiver in communication.C．The distance between communicators can’t be too long.D．They are not restricted in time and space.
A．They don’t need conventional signs and symbols.
B．They only require a receiver in communication.
C．The distance between communicators can’t be too long.
D．They are not restricted in time and space.
填空题
overestimate
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