A conscious victim who has suffered a blow to the head has symptoms that indicate the possibility of concussion. If the patient feels no indication of neck or spine injury，recommended treatment would include（）.

A continual worsening of the list or trim of any floating ship indicates（）.

A chart with a scale of 1:80，000 would fall into the category of a（）.

A common class of wire rope used for mooring is the 6x19 class. What does the 6 represent?（）

A “l(fā)iner” in riveted construction of a vessel is a(n)（）.

A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.

A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.

A block and tackle is “rove to advantage”. This means that the（）.

A continuous watertight bulkhead on a ship is normally also a(n)（）.

A crew member has suffered frostbite to the toes of the right foot. Which is NOT an acceptable first aid measure?（）