Where, following an abnormal condition, the removal of dust accumulations or layers cannot be assured, then the area is to be classified zone 21.
如果不能保证排除可燃性粉尘堆积或粉尘层时，则应划分为21区。
Where, following an abnormal condition, the removal of dust accumulations or layers cannot be assured, then the area is to be classified zone 21.
如果不能保证排除可燃性粉尘堆积或粉尘层时，则应划分为21区。
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