单选题Static electricity may be built up by the（）.Aflow of petroleum through pipesBspraying or splashing of petroleumCsettling of solids or water in petroleumDAll of the above
单选题
Static electricity may be built up by the（）.
A
flow of petroleum through pipes
B
spraying or splashing of petroleum
C
settling of solids or water in petroleum
D
All of the above
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