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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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.
单项选择题
A．Six.B．Three.C．Two.D．Four.
A．Six.
B．Three.
C．Two.
D．Four.
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