单选题The remote control for a fixed fire extinguishing system should be（）.Apainted red and labeledBconcealed from the crewCprotected by plexiglassDpadlocked
单选题
The remote control for a fixed fire extinguishing system should be（）.
A
painted red and labeled
B
concealed from the crew
C
protected by plexiglass
D
padlocked
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