Experiments were carried out in many countries, sometimes with models driven by steam engines, but these were too heavy to be used in an airplane with a pilot.
【单选题】The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs.This procedure should not be used ().
A.
when the declination and latitude are of different names
B.
when the declination is greater than and the same name as the latitude
C.
if the vessel is stopped or making bare steerageway
D.
on a fast vessel on northerly or southerly headings