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单项选择题
A．Problems with aircraft.B．Problems with computers.C．Too many passengers.D．Too few pilots and passengers.
A．Problems with aircraft.
B．Problems with computers.
C．Too many passengers.
D．Too few pilots and passengers.
单项选择题
A．60 volts.B．110 volts.C．220 volts.D．240 volts.
A．60 volts.
B．110 volts.
C．220 volts.
D．240 volts.
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