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單項(xiàng)選擇題

A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial

你可能感興趣的試題

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

A.pump out
B.to pump out
C.pumping out
D.be pumped out