Where advance freight is agreed upon，payment does not depend on delivery and must be made （）the ship is lost and the cargo never delivered.

A.Unless
B.When
C.Because
D.Even though

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What does the DSC control unit do if the GMDSS radio operator fails to insert updated information when initiating a DSC distress alert（）.

A.It will abort the transmission and set off an audible alarm that must be manually reset
B.It will initiate the DSC distress alert but，as no information will be transmitted，rescue personnel will not be able to identify the vessel，its position or its situation
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D.It will initiate the DSC distress alert，but any station receiving it will have to establish contact with the distressed vessel to determine its identity，position and situation

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The port State control officer or the surveyor authorized by the port State Administration must be aware that（）may be carried on product carriers.

A.category A substances
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D.category B,C and D substances

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