What best describes benzene ________．
A. Clear colorless liquid with an acrid odor
B. Clear colorless liquid with an aromatic odor
C. Brownish liquid，odorless
D. Brownish liquid，with an acrid odor
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You are planning to use a crude oil washing system．What precaution must be taken with the
A. It must be debottomed and the level lowered by at least one meter
B. The oil in the source tank must be sampled for compatibility
C. The source tank must have been crude oil washed at least once in the past 150 days
D. The inert gas system must lower the oxygen content to a maximum of 12% oxygen in the tank
Your tanker is fully loaded，and you find that she is down slightly by the head．To adjust the trim，you may ______．
Add ballast aft
B. Load more cargo aft
C. Shift cargo aft
D. All of the above
You are on a vessel that carries liquefied gasses in bulk．The person on watch is required
A. Port of loading
B. Exact quantity on board
C. Name and address of consignee
D. Firefighting procedures
You are planning to use the crude oil washing system on your tanker．What is required to prevent electrostatic buildup in the tanks ________．
A. The portable machines should be set at the proper drop for the first wash before the fixed machines are used
B. The tank used as the source for the tank cleaning machines should be debottomed for at least one meter
C. The inert gas system must reduce the oxygen content in the tank to at least 18%
D. The fixed machines must be operated simultaneously with the portable machines to equalize the electrostatic potential
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