A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
您可能感興趣的試卷
你可能感興趣的試題
A.operation of electrical equipment and generators on board ship
B.the earth's magnetic field affecting the ship's hard iron during construction
C.the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D.the vertical component of the earth's magnetic field acting on the vertical soft iron
A.Appendicitis
B.Cholera
C.Plague
D.Typhus fever
A.Jaundice by fever
B.Acute skin rash or eruption with or without fever
C.Duodenitis
A.Drape along brackets
B.Leave in place while back loading cargo to save time
C.Hang vertically in the paint locker
D.All of the above
A.three barrels
B.four barrels
C.six barrels
D.eight barrels
最新試題
A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
An obstruction on a helodeck is any object that might present a hazard to the（）.
All ships（）suspected infectious disease on board should radio information to Port Health Officer.
A helmsman receives the command “Right 15 degrees rudder.”The helmsman’s IMMEDIATE reply should be（）.
A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.
A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.
After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means（）.
Permanent magnetism is found in（）.
A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.