My position has been obtained by().
A、astronomical observation
B、hydrographic survey
C、weather prediction
D、current sailing
A、astronomical observation
B、hydrographic survey
C、weather prediction
D、current sailing
A、My ship has been maintained B、My ship has been painted C、All my crew members have been vaccinated D、All my crew members have no quarantinable diseases
A、I have some dangerous cargo on board B、My cargo is dangerous C、My vessel is inclined D、My vessel has not been trimmed properly
A、the ship has been named B、the ship has been built C、the ship has been signed D、the ship has been registered