Electrical wiring on all T-Boats must be（）.<br>A:concealed to prevent mechanical damage<br>B:concealed so the boat can be maintained more easily<br>C:protected from the weather<br>D:in an accessible place behind the ceiling

Electrical wiring on all T-Boats must be（）.
A:concealed to prevent mechanical damage
B:concealed so the boat can be maintained more easily
C:protected from the weather
D:in an accessible place behind the ceiling

出自：海船船员证

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