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（）is not an advice be observed when samples are taken in tanks containing volatile petroleum products.
A:Filter masks with a combination filter should be brought and used whenever necessary
B:Only explosion-proof equipment（marked EEx）should be used
C:Avoid breathing petroleum gases，especially if they come from sour crude（smell of rotten eggs）
D:so far as possible，take early and substantial action to keep well clear

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出自：海船船员证

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