题目：
The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in （） of operation are immediately implemented.
A.ahead or astern
B.fore or aft
C.up or down
D.speed or direction
答案：
参考答案：D
The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in （） of operation are immediately implemented.
A.ahead or astern
B.fore or aft
C.up or down
D.speed or direction
参考答案：D
