The（） only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.<br>A:central air condition system<br>B:high velocity system<br>C:low velocity system<br>D:single duct system

The（） only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.
A:central air condition system
B:high velocity system
C:low velocity system
D:single duct system

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