As a duty sailor, he should （）.<br>A:keep a gangway watch<br>B:often look around the ship<br>C:hoist and lower national flag on time<br>D:A+B+C

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

出自：船舶水手证

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