单项选择题

Who would be very much interested in the passage

A．Missile builders.
B．Fishermen.
C．Military scientists.
D．Ship builder.
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单项选择题
Which of the following is NOT true of a laser system
A．It is able to make its way through water.
B．It is able to communicate with submarines at work.
C．Its beam reaches a submerged submarine with the help of an antenna.
D．It is able to carry more data than low frequency waves.
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