在船上应当日落时降下国旗.（）<br>A:We should lower national flag when the sun sets.<br>B:We should lower national flag when the ship is in port.<br>C:We should lower national flag when loading and unloading.<br>D:We should lower national flag when the sun rises.

在船上应当日落时降下国旗.（）
A:We should lower national flag when the sun sets.
B:We should lower national flag when the ship is in port.
C:We should lower national flag when loading and unloading.
D:We should lower national flag when the sun rises.

出自：船舶水手证

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