問題詳情
9. What instrument played a key role in solving the ‘longitude problem’; the problemof finding longitude at sea before advanced GPS?
(A) instrument A
(B) instrument B
(C) instrument C
(D) instrument D
9. What instrument played a key role in solving the ‘longitude problem’; the problemof finding longitude at sea before advanced GPS?
(A) instrument A
(B) instrument B
(C) instrument C
(D) instrument D