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?（）

Pump out No.2 port ballast tank to（）.

Existing crude oil tankers may，（）being provided with segregated ballast tanks or operating with a cargo tank cleaning procedure using crude oil washing，operate with dedicated clean ballast tanks in accordance with the specified provision of the Regulation.

Every new crude oil tanker of 20000 tons deadweight and above shall be fitted with a cargo tank cleaning system using（）.

Each fire pump on a tanker must have a pressure gauge located at（）.

For the purpose of（）tank or hold washings from any vessel，an application shall be made to Harbor Authorities for approval.

Protective clothing must be worn while sampling hazardous cargo on a tanker，and as a minimum includes（）.

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.

Each fireman’s outfit and its spare equipment on a tanker must be stowed in a(n)（）.

In order to reduce the accumulation of static electricity while loading petroleum products，you should（）.