A.an above-deck datum such as the top of the ullage pipe
B.the tank ceiling aboard transversely framed vessels
C.the tank top
D.a thievage mark below the edge of the deck
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A.the tank ceiling
B.the tank top bushing
C.the thievage mark
D.an above deck datum
A.the base of the expansion trunk
B.the base of the ullage port
C.a line scribed within the ullage port
D.an above-deck datum，usually the top of the ullage hole
A.hold a valid officer's license for inspected vessels
B.be a certificated tankerman
C.be 30 years old
D.have a letter from the company stating his qualification
A.refer to the vessel's Certificate of Inspection
B.examine the cargo tanks and fittings
C.ask the terminal supervisor or his representative
D.check the loading order
A.common carrier
B.tramp
C.public vessel
D.bulk carrier
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Air gap is the vertical distance between the bottom of the hull and the（）.
According to regulations，access to a cargo pumproom in a tanker carrying grades C or D liquid cargo shall be（）.
Ullages on tankers are measured from（）.
An oil tanker，except as provided for otherwise，might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.
Sea water temporarily pumped into tanks to simulate the increased vertical loading of environmental forces is termed（）.
The safe working load for the assembled cargo gear and the minimum angle to the horizontal for which the gear is designed shall be marked on the（）.
If reefer spaces are not properly cleaned prior to loading cargo，it will most likely cause（）.
Ullages are measured from（）.
In observing rig motion while under tow，the period of roll is the time difference between（）.
A vessel has an amidships superstructure. Which location would be most suitable for on-deck stowage of automobiles?（）.