单选题Before any machinery is put in operation，you should（）.Aventilate all compartments，see that the machinery is clean and there are no obstructionsBjust turn the key and start upCtake for granted that there are no fuel leaksDassume there are no volatile fumes in the engine space
单选题
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
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