单项选择题
A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
单项选择题 Emulsification of oil will occur when mixed with （）.
单项选择题 The bilge main is arranged to drain any watertight compartment （） ballast, oil or water tanks and to discharge the contents overboard.
单项选择题 Oil water separators are used to ensure that ships dont discharge oil when pumping out （）.