题目:
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
答案:
参考答案:D
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
参考答案:D