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

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.

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?（）

Individual wires，used in systems greater than 50 volts,（）.

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

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

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

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

Chemical Tankers are generally referred to the cargo ships constructed or adapted and used for the carriage of（）.

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