单项选择题


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A．By a central control system.
B．By several separated computers.
C．By a mechanical ann.
D．By a few people.
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What are the two major kinds of mapsThey are ______ maps and ______ maps.
单项选择题
A．Eight hours.B．Three hours and a half.C．Two hours and a half.D．Four hours.
A．Eight hours.
B．Three hours and a half.
C．Two hours and a half.
D．Four hours.
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