船舶由淡水水域驶入半淡水水域时，船舶所受浮力（）。

【名词&注释】

排水量(displacement)

[单选题]船舶由淡水水域驶入半淡水水域时，船舶所受浮力（）。

A. 减少
B. 增加
C. 不变
D. 变化不定

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学习资料：

[单选题]某轮在某装载状态下的一处水线位于水尺标志“Ⅸ”字体的底边缘，则该处的吃水为（）。

A. A．8ft6in
B. B．9ft
C. C．9ft3in
D. D．9ft6in

[单选题]某轮排水量Δ=17272t，由密度为ρ1=1.014g/cm3的水域驶入密度为ρ2=1.002g/cm3，每厘米吃水吨数TPC=24.18t，则其平均吃水改变量为（）m。

A. A．0.061
B. B．0.069
C. C．0.078
D. D．0.086

[单选题]某轮船宽为20m，当其右倾2°时，左舷吃水减少（）m。

A. A．0.175
B. B．0.35
C. C．0.55
D. D．0.60

[单选题]The Plimsoll mark on a vessel is used to（）.

A. align the vessel's tailshaft
B. determine the vessel's trim
C. determine the vessel's freeboard
D. locate the vessel's centerline

[单选题]The TPC curve，one of the hydrostatic curves in a vessel’s plans，gives the number of tons（）.

A. necessary to change the angle of list 1°at a given draft
B. necessary to change trim 1 cm at a given draft
C. pressure per square cm on the vessel's hull at a given draft
D. necessary to further immerse the vessel 1 cm at a given draft

[单选题]A moment is obtained by multiplying a force by its（）.

A. couple
B. lever arm
C. moment of inertia
D. point of applicatio

[单选题]The amount of freeboard which a ship possesses has a tremendous effect on its（）.

A. initial stability
B. free surface
C. stability at large angles of inclination
D. permeability

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