单项选择题

On a ship，each emergency generator must be tested at least once each（）.

A.week
B.month
C.three months
D.six months

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Kort nozzles are installed around the propellers of some vessels to（）.

A.Increase the thrust of the propeller
B.Protect the propeller from striking sawyers
C.Prevent the propeller from striking barges towed on the ship
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Good title to the Goods delivered to the ship shall not pass to the（）until full payment for same has been made.

A.Vendor
B.Purchaser
C.Master
D.Shipper