A spherical buoy may be（）.

1、Error may be introduced into a magneti

Error may be introduced into a magnetic compass by（）.Amaking a structural change to the vesselBa short circuit near the compassCbelt bucklesDAll of the above

2、A yellow buoy may mark a(n)（）.

A yellow buoy may mark a(n)（）.AwreckBshoal areaCanchorage areaDmiddle ground

3、（）may be a warning for an approaching

（）may be a warning for an approaching storm.AThe persence of cirrus cloudsBThe low-hanging stratus cloudsCThe altocumulus cloudsDThe massive cumulus cloud

4、A yellow buoy may exhibit a(n)（）.

A yellow buoy may exhibit a(n)（）.Afixed red lightBflashing lightCwhite lightDocculting light

5、A maritime lien may be placed against（

A maritime lien may be placed against（）.Aany assets that a ship's owner may haveBa vessel，cargo，or freightCobjects that are fixed and immovable，such as wharvesDthe vessel only

6、（）may be defined as a departure withou

（）may be defined as a departure without justification and under no necessity from the proper and usual course of an agreed voyage，whereby the character and the incidents of such voyage are altered.ADeviationBChangeCAlterationDAmendment