单项选择题
0il product samples should be taken from the（）.
A.dock riser
B.ships cargo tanks
C.shore tank discharge
D.All of the above
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A.furnishes support to the rudder, propeller shaft, and transom frame
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C.provides foundation for the main propulaion engines
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0n a vesel proceeding from a very cold to a warm climate with a cargo of a nonhygroscopic nature in the holds, which is true?（）.
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