单选题（）is not an advice be observed when samples are taken in tanks containing volatile petroleum products.AFilter masks with a combination filter should be brought and used whenever necessaryBOnly explosion-proof equipment（marked EEx）should be usedCAvoid breathing petroleum gases，especially if they come from sour crude（smell of rotten eggs）Dso far as possible，take early and substantial action to keep well clear
单选题
（）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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