单选题To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.Ain entranceBin exitCin the upper partDon the outside
单选题
To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.
A
in entrance
B
in exit
C
in the upper part
D
on the outside
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