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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.

A. The agent usually provides stores and provisions to the ship.
B. The shipyard usually provides stores and provisions to the ship.
C. The ship chandler usually provides stores and provisions to the ship.
D. The captain usually provides stores and provisions to the ship