Guide tolerances during elevation of the jack-up rig will（）.

How is the annual rate of change for magnetic variation shown on a pilot chart?（）

Horizontal subdivision decks forming watertight compartments in the columns of a semisubmersible ship increase the unit’s（）.

How can the Coast Guard determine that a crew member is “able to understand any order spoken by the officers”?（）

Good seamanship while towing in heavy weather requires all of the following EXCEPT（）.

How does the effect known as “bank suction” act on a single-screw vessel proceeding along a narrow channel?（）

Generally speaking，in the Northern Hemisphere，when winds are blowing from between SE and SW the barometric reading（）.

How do the height and location of a tug’s towing bitts relate to the danger of tripping?（）

How can you estimate the position of a tropical storm’s center?（）

Freeboard is measured from the upper edge of the（）.