Static electricity may be built up by the（）.<br>A:flow of petroleum through pipes<br>B:spraying or splashing of petroleum<br>C:settling of solids or water in petroleum<br>D:All of the above

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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