更多"What is used for preventing polluti"的相关试题:
[单项选择]If the gyrocompass error is east，what describes the error and the correction to be made to gyrocompass headings to obtain true headings?（）.
A. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true
B. The readings are too low and the amount of the error must be subtracted from the compass to obtain true
C. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true
D. The readings are too high and the amount of the error must be subtracted from the compass to obtain true
[单项选择]In the construction of a diesel engine, what is the purpose of end plates?（）
A. To provide accessibility to the cylinder liners
B. To add stability to the engine block
C. To add rigidity to the block and a surface for attaching other parts
D. To make a surface for the base
[单项选择]Which of the following methods might be used as the treatment on emulsified oil?（）
A. gravity separation
B. centrifuge
C. Cyclone
D. Cross-flow membrane filtration
[单项选择]A document used to indicate suspected cargo damage caused by rough weather would be the （）.
A. cargo report
B. hull damage report
C. Master's Note of Protest
D. Unseaworthy Certificate
[单项选择]What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
A. Flinders bar
B. Soft iron spheres
C. Fore-and-aft permanent magnets in their trays
D. Heeling magnet
[单项选择]What is used to prevent twisting of a towing bridle?（）
A. A bitt
B. A bulkhead
C. A V-spring
D. A fishplate
[单项选择]What is used as an indicator of initial stability? （）
A. GM
B. KG
C. KM
D. GZ
[单项选择]Generally, what is used to inflate life rafts?（）.
A. Non-toxic gas
B. oxygen
C. Hydrogen
D. Helium
[单项选择]What is used to test a tank for oxygen content?（）
A. Combustible gas indicator
B. Vapor indicator
C. Atmosphere analyzer kit
D. None of the above
[单项选择]An oxygen indicator can be used to determine if there is（）.
A. sufficient oxygen in a compartment to support life
B. combustible gases present
C. hydrogen gases present
D. All of the above
[单项选择]What equipment is customarily used when seamen are working on a stage rigged over the side of a vessel（）.
A. Jacob's ladder
B. Manropes
C. Heaving lines
D. All of the above
[单项选择]What can be used to measure the percentage of oxygen inside a chain locker?（）
A. Flame safety lamp
B. Combustible gas indicator
C. Oxygen indicator
D. H2S meter
[单项选择]What is commonly used to create turbulence in a diesel engine combustion system?（）
A. Shape of the piston crowns
B. Increasing the compression ratios
C. Increasing the piston crowns
D. Increasing the turbocharger gear ratio
[单项选择]A common class of wire rope used for mooring is the 6x19 class. What does the 6 represent?（）
A. Factor of safety
B. Number of wires per strand
C. Number of strands per wire rope
D. Number of wires in the core
