A.18 months B.2 years C.3 years D.5 years
A.to B.of C.for D.about
A.The required oily-water separator malfunctions B.The ship is transferred to Liberian registry C.An annual survey is conducted fifteen months after the date of certificate issuance D.A 15 ppm oily-water separator is replaced by a 100 ppm oily-water separator