单项选择题

A．Mechanic problems.
B．The weather.
C．The fact that the crew is not ready.
D．The fact that the flight is overbooked.
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单项选择题
A．Free concert tickets.B．The singer’s photo.C．The singer’s post.D．A special gift.
A．Free concert tickets.
B．The singer’s photo.
C．The singer’s post.
D．A special gift.
问答题
S2. According to the author, how can effective use be made of modem manufacturing systems
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