Before any machinery is put in operation，you should（）.<br>A:ventilate all compartments，see that the machinery is clean and there are no obstructions<br>B:just turn the key and start up<br>C:take for granted that there are no fuel leaks<br>D:assume there are no volatile fumes in the engine space

Before any machinery is put in operation，you should（）.
A:ventilate all compartments，see that the machinery is clean and there are no obstructions
B:just turn the key and start up
C:take for granted that there are no fuel leaks
D:assume there are no volatile fumes in the engine space

出自：海船船员证

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