(1.5 分)
The purpose of checking the navigational aids is _________.
A.to steer the course B.at frequent intervals C.to ensure the ship follows the planned course D.to use them safely正确答案C
(1.5 分)
The purpose of checking the navigational aids is _________.
A.to steer the course B.at frequent intervals C.to ensure the ship follows the planned course D.to use them safely正确答案C
