（）is a computer technology that headsets,sometimes in combination with physical spaces or multi-projected environments,to generate realisitic images,sounds and other sensations that simulate a user’s physical presence in a virtual or imaginary environment.

People wandering in the fairground or park area（）wear a uniform.

What must the Master or person in charge of a ship enter in the logbook after conducting a boat drill? （）

In order to communicate the threat at a port facility or for a ship, the Contracting Government will set the appropriate security levels Security level 1 corresponds to（）

Structural stress on a ship can be reduced by（）.

Structural stress levels in a ship are the sum of loading stresses and stresses due to（）.

In order to prevent stress from being set up in the metal, expansion joints are fitted which _____ the stress by allowing the pipe to expand or contract freely.

EXCEPT when suffering from a head or chest injury a patient in shock should be placed in which position?（）.

The“person in the phrase ”to designate a person or persons ashore having direct access to the highest level of management” refers to （）.

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

The （） is used for hauling in or letting out the wires or ropes.

SOLAS requires a lifesaving training manual be provided in each crew cabin or in the（）.