External and internal leakage in hydra

1、In the presence of external forces，the

In the presence of external forces，the center of buoyancy of an inclined vessel is vertically aligned with the（）.Acenter of gravityBmetacenterCcenter of flotationDkeel

2、In a crossing situation on internation

In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.Ais holding course and speedBis turning to starboardCintends to pass port to portDwill keep out of the way of the stand-on vessel

3、Air leakage between the shaft and stuf

Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.Aa compressed packing glandBlantern tings between the packing ringsCa liquid sealDthe stuffing box gland

4、Comparative advantage（in international

Comparative advantage（in international trade） （国际贸易中的）比较优势

5、In the absence of external forces，the

In the absence of external forces，the center of buoyancy of an inclined vessel is vertically aligned directly below the（）.Acenter of gravityBamidships stationCcenter of flotationDgeometric center of the waterplane area

6、In the absence of external forces，addi

In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to ().Aheel until the angle of loll is r...