单项选择题

A．one, one
B．one, two
C．two, two
D．two, one
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单项选择题
A．America.B．Australia.C．Asia.D．Europe.
A．America.
B．Australia.
C．Asia.
D．Europe.
单项选择题
A．Generator malfunction.B．Computer error.C．A collision with another station.D．All the above.
A．Generator malfunction.
B．Computer error.
C．A collision with another station.
D．All the above.
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