On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.

Strengthening damaged bulkheads by using wood or steel is called（）.

For cargoes（）grain meals，coal，ventilation is needed to prevent them（）spontaneous combustion.

The center of gravity of a freely swinging load suspended from a pedestal crane acts as if it were located at the（）.

Transverse frames are more widely spaced on a ship that is designed with the（）.

Stanchions prevent the entire deck load on a ship from being carried by the（）.

I hereby（）you，on behalf of the Loocki Grain Co.，Lisbon，to pay to the Harbor Master of the Santa Marta，Columbia，the sum of 500，000 Peso which represents a fine levied on the above-named vessel for polluting the coastal waters with oily water.

When a wind force causes a floating ship to heel to a static angle，the（）.

Ship’s officers should check every cargo compartment after it is filled with bulk grain to ensure（）.

In vessel construction，beams are transverse girders which provide support to（）.