單項選擇題Mariners must ascertain that deck loads are stowed in such a manner as（）.
A.to affect the vessel's stability
B.not to affect the vessel's stability
C.to keep the vessel on even keel
D.not to keep the vessel on even keel
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1.單項選擇題Mariners not entering the port are（）to keep at least one mile off.
A.advised
B.reported
C.complied
D.supplied
2.單項選擇題Masts and derricks of cargo ships are made of（）.
A.steel
B.copper
C.bross
D.zinc
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