What safety precautions should be observed by the crew while working around machinery in an engine room?（）<br>A:They should wear safety shoes<br>B:They should wear ear protection<br>C:They should not wear jewelry<br>D:All of the above

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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