Safe welding practice requires （）<br>A:checking the area for items that may catch fire<br>B:that a fire watch be posted<br>C:checking for the explosive gases<br>D:all of the above

Safe welding practice requires （）
A:checking the area for items that may catch fire
B:that a fire watch be posted
C:checking for the explosive gases
D:all of the above

出自：海船船员证

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