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單項選擇題

在船上應(yīng)當(dāng)日出時升起國旗。（）

A. On board national flags should be hoisted when the sun sets.
B. On board national flags should be hoisted when the sun rises.
C. On board national flags should be lowered when the ship is in port.
D. On board national flags should be hoisted flag when loading and discharging

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