Stability is determined principally by the location of two points in a vessel: the center of buoyancy and the（）.

A . which exists when the wind speed is less than 50 knots B . before collision C . after flooding D . at the maximum load

A . intact stability B . initial stability C . immersion stability D . damage stability

A . center of gravity is lowered B . center of buoyancy is lowered C . reserve buoyancy is unchanged D . hull freeboard is increased

A . laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two places B . measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolution C . rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottom D . taking micrometer reading between the crank cheeks opposite the crankpin every 90°of crank angle rotatio

A . increase the righting moment B . cause an increase in the righting arm C . bring the vessel to an upright equilibrium position D . cause the vessel to flop to a greater angle

A . metacentric height B . height of the metacenter above the keel C . height of the center of buoyancy above the keel D . height of the center of gravity above the keel

A . metacentric height B . displacement C . righting moment D . inclining moment

A . metacentric height B . displacement C . righting moment D . inclining moment

A . increase the righting moment B . cause an increase in the righting arm C . bring the unit to an upright equilibrium position D . cause the unit to flop to a greater angle

A . aft perpendicular B . center of buoyancy C . keel D . center of flotatio

A . The metacenter does not remain in the same position for large angles of inclination B . The center of gravity shift due to inclination C . The center of gravity shifts above the metacenter as the vessel is inclined D . The mean draft will change as the vessel is inclinded

A . dividing the total longitudinal moment summation by displacement B . dividing the total vertical moment summation by displacement C . multiplying the MT1 by the longitudinal moments D . subtracting LCF from LCB

A . dividing the total longitudinal moment summations by displacement B . dividing th etotal vertical moment summation by displacement C . multiplying the MTC by the longituinal moments D . subtracting LCF from LCB

A . water depth B . keel C . center of flotation D . center of buoyancy

A . off-center loading B . stiff characteristics C . excessive pitch or roll D . negative initial stability

A . a curve of minimum operational metacentric height（GM）versus draught B . instructions concerning the operation of cross-flooding arrangements C . the signals or lights being exhibited or sounded D . all other data and aids which might be necessary to maintain stability after damage

A . Length of link in inches B . Diameter of metal in link in inches or centimeters C . Links per fathom D . Weight of stud cable in pound

A . GM B . KG C . KM D . GZ

A.jump B.swim C.pose D.happy

A．A concrete foundation supports the arch. B．The arch is built with wedge-shaped blocks. C．The Romans made a strong type of concrete. D．The pressure flows up to the keystone.

A．Africa. B．The southern hemisphere. C．Egypt. D．All the developed countries.