单项选择题

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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A fishing vessel displaying the lights shown is（）.

A.anchored
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C.tending a small fishing boat
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A fire pump may be used for other purposes if（）.

A.the other services are run off a reducing station with a pressure gage
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C.no relief valves are installed
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