_______ is a circle on the surface of the earth, the plane of which passes though the centre of the earth.
A.great circle
B.circle distance
C.a turn
D.turning degree
正确答案是A
_______ is a circle on the surface of the earth, the plane of which passes though the centre of the earth.
A.great circle
B.circle distance
C.a turn
D.turning degree
正确答案是A