单选题What safety precautions should be observed by the crew while working around machinery in an engine room?（）AThey should wear safety shoesBThey should wear ear protectionCThey should not wear jewelryDAll of the above
单选题
What safety precautions should be observed by the crew while working around machinery in an engine room?（）
A
They should wear safety shoes
B
They should wear ear protection
C
They should not wear jewelry
D
All of the above
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