In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.

In which case is the IOPP Certificate of an inspected vessel NOT invalidated? （）

During oil transfer operations，who is responsible for ensuring that the posted transfer procedures are followed?（）.

After an IOPP Certificate is issued to an inspected vessel，how many other surveys of the vessel’s pollution prevention equipment are conducted during the period of validity of the certificate?（）

On a vessel carrying grades A，B，C or D cargoes，enclosed spaces where sources of vapor ignition are normally present shall NOT be segregated from cargo tanks by（）.

If you are bunkering and you close off one tank in the line of tanks being filled，the rate of flow to other open tanks on the same line will（）.

How must each storage tank for helicopter fuel on a ship be marked?（）

If the Certificate of Inspection of a damaged tank barge has expired，which certificate may be issued to allow its movement to a repair facility? （）

Pump out No.2 port ballast tank to（）.

Any oil tanker which is not required to be provided with segregated ballast tanks in accordance with this paragraph may，however，be qualified as a segregated ballast tanker （）it complies with the other requirements of paragraphs of this Convention.