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单选题
A ground in an electrical circuit outside the engine room （）.
A
cannot be detected tinder normal conditions
B
is of no consequence to engineering personnel
C
is indicated at the branch circuit breaker panel
D
is indicated by the ground detecting lamps on the main switchboard
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单选题In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.A
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考题
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