7. What equipment is necessary aboard vessels to prevent the discharge of oil overboard when pumping out bilges, ballasting or when cleaning oil tanks?
(A) Compressor
(B) Oil-water separator
(C) Actuator
(D) Evaporator

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統計: A(54), B(615), C(52), D(41), E(0) #1767657

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7. What equipment i...
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