问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A
