Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.

Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.

Fire may be spread by which means?（）

Foam-type portable fire extinguishers are most useful in combating fires involving（）.

Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.

During which condition should the operator of a pedestal crane shutdown operations?（）

During transfer operations，a quantity of propylamine spills on deck. According to the Chemical Data Guide，the correct procedure would be to（）.

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

During the day，a vessel picking up a submarine cable shall carry（）.

During which condition should the operator of a pedestal crane shutdown operations?（）