你可能感興趣的試題

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

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