單項選擇題In snall angle stability, when external forces exist , the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the（）.

A.center of gravity
B.center of flotation
C.metacenter
D.metacentric height


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2.單項選擇題In the piping systems of a vessel , what type of valve gives the least resistance to fluid flow when fully open?（）.

A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve

3.單項選擇題In the presence of external forces ,the center of buoyancy of an inclined vessel is vertically aligned with the（）.

A.center of gravity
B.metacenter
C.center of flotation
D.keel

4.單項選擇題In writing up the log book at the end of your watch , you make an error .which of the following is the way to correct the error?（）.

A.Carefully and neatly erase the entryand rewrite it correctly
B.Remove this page of the log book and rewrite all entries on a clean page
C.Blot out the error completely and rewrite the entry correctly
D.Cross out the error with a single line and rewrite the entry correctly

5.單項選擇題In writing up the logbook at the end of your watch,you make an erron in writing an entry. What is the proper means of correcting this error?（）.

A.cross out the error with a single line,and write the correct entry ,then initialit
B.carefully and neatly erase the and rewrite it correctly
C.remove this page of the log book , and rewrite all entries on a clean page
D.Blot out the error completely and rewrite the entry correctly