单项选择题

A．The white-collar workers.
B．The blue-collar workers.
C．Both the economists and stockholders.
D．The persons with business interests and investments.
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functions
单项选择题
A．To drive the train after it is started automatically.B．To start the train and to drive it when necessary.C．To take care of the passengers on the train.D．To send commanding signals to the command spot.
A．To drive the train after it is started automatically.
B．To start the train and to drive it when necessary.
C．To take care of the passengers on the train.
D．To send commanding signals to the command spot.
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