When loading a tanker，you should ______．
A. load only one tank at a time
B. keep the seamen on watch on standby in the mess room
C. keep a strain on the loading hoses
D. close valves by closing them down，reopening one or two turns，and re-closing
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When referring to quantity of barite in a P-tank，ullage is the ______．
A. Distance of the barite surface above the tank bottom
B. Percentage of barite in the tank
C. Distance of the barite surface below the tank cover
D. Total weight of barite in UPC（ullages per centimeter）
When bunkering is complete，the hoses should be ______．
A. Cleaned internally with a degreaser
B. Washed out with hot soapy water
C. Drained，blanked off，and stored securely
D. Stowed vertically and allowed to drain
When displacement increases，the free surface corrections for slack tanks ______．
A. increase
B. decrease
C. are directly proportional
D. remain unchanged
When a tank is to be gas freed after washing，the concentration of hydrocarbon vapour should be reduced by purging the inerted cargo tank with ______．
A. the oxygen
B. the gas
C. the inert gas
D. the hydrocarbon vapour
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