单项选择题

A．Every room has a heater.
B．The Central room has a heater.
C．A heat chamber heats air and passes the warm air through ducts and openings into rooms.
D．The rooms are installed with blowers or convection.
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单项选择题
A．To revolutionize research and develop speed.B．To revolutionize travel and shatter speed records.C．To revolutionize flight and explore outer space.D．To revolutionize exploration and increase experienc
A．To revolutionize research and develop speed.
B．To revolutionize travel and shatter speed records.
C．To revolutionize flight and explore outer space.
D．To revolutionize exploration and increase experienc
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