試題詳解

2. While transit (range) is using, for extreme accuracy what is the distance between the observer and the nearer object?
(A) No more than 3 times the distance between the objects observed.
(B) No more than 4 times the distance between the objects observed.
(C) No more than 5 times the distance between the objects observed.
(D) No more than 6 times the distance between the objects observed.