【单选题】
As a duty sailor, he should （）.
A、keep a gangway watch
B、often look around the ship
C、hoist and lower national flag on time
D、A+B+C
查看正确答案
A、A. As an officer on duty, you must know how to adjust derricks. B、B. As a sailor on duty, you must know how to adjust derricks. C、C. As a sailor on duty, you must know how to operate cranes. D、D. As an officer on duty, you must know how to operate cranes.
