单选题Vertically below the deckline is a circle whose outside diameter is 300mm.It is called the（）.A the deck lineB Plimsoll discC Plimsoll lineD summer load line

The depth of the ship below the waterline measured vertically to the lowest part of the hull is called

A.trim

B.lean

C.draft

D.tonnage

At all angles of inclination, the metacenter is ______.

A.vertically above the center of buoyancy

B.vertically above the center of gravity

C.at the intersection of the upright vertical centerline and the line of action of the buoyant force

D.at the geometric center of the underwater volume

Assignable cause or special variation is:

A . is indicated when a point falls outside the control limits.

B . is indicated when a point falls outside the specification limits.

C . is indicated when a run of seven or more points fall above the center line of a standard control chart.

D . is indicated when a run of seven or more points fall below the center line of a standard control chart.

E . A, C, and D.

The fresh air intake of the inert gas system ______，

A.Prevents the flue gas from falling below 3% content of oxygen

B.Allows the inert gas piping to be used for gas freeing the tanks

C.Opens when there is excessive vacuum on the deck water seal

D.Enables outside air to mix with and cool hot flue gasses

134 Assignable cause or special variation is:

A. is indicated when a point falls outside the control limits.

B. is indicated when a point falls outside the specification limits.

C. is indicated when a run of seven or more points fall above the center line of a standard control chart.

D. is indicated when a run of seven or more points fall below the center line of a standard control chart.

E. A, C, and D