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Frames to which the tank top and bottom shell are fastened are called ______．
A.floors
B.intercostals
C.stringers
D.tank top supports
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单选题When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.A
one meter from the tank bottom and one meter below the tank topB
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单选题Floors aboard ship are（）.A
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单选题Floors aboard ship are（）.A
frames to which the tank top and bottom shell are fastened on a double bottomed shipB
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单选题A tank which is not completely full or empty is called（）.A
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单选题When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.A
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one half the ullage of the tank and one meter above the tank bottomD
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runaroundC
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单选题Frames to which the tank top and bottom shell are fastened are called（）.A
floorsB
intercostalsC
stringersD
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单选题The fore and aft run of deck plating which strengthens the connection between the beams and the frames and keeps the beams square to the shell is called the（）.A
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单选题Longitudinal and transverse separtions between the tanks,which are used to prevent liquids from leaking from one double bottom tank into the other ,are called（）.A
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cofferdamC
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单选题The inner bottom is the（）.A
tank topB
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On the outside of the tankB
At the bottom of the tankC
At the top of the tankD
At the center of the tank
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