A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.<br>A:one control<br>B:two controls<br>C:three controls<br>D:none of the above

A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.
A:one control
B:two controls
C:three controls
D:none of the above

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