更多"Permanent magnetism is caused by（）."的相关试题:
[单项选择]This induced magnetism（）the permanent magnetism already present in the ship.
A. will add to
B. will subtract from
C. may add to or subtract from
D. will not change
[单项选择]Permanent magnetism is found in（）.
A. hard iron
B. soft iron
C. vertical iron only
D. horizontal iron only
[单项选择]The permanent magnetism of a vessel may change in strength due to（）.
A. the nature of the cargo being carried
B. changes in heading
C. major structural repair
D. All of the above
[单项选择]Induced magnetism is found in（）.
A. hard iron
B. soft iron
C. vertical iron only
D. horizontal iron only
[单项选择]The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
A. permanent magnetism
B. subpermanent magnetism
C. induced magnetism
D. variable magnetism
[名词解释] 永久性细胞（Permanent cells）
[单项选择]Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A. install shoring so the shoring supports the damaged bulkheads without pushing on them
B. install shoring so that it pushes on the damaged bulkhead while supporting it
C. use jacks or chain falls to remove the set before installing shores
D. place sandbags by the bulkhead without installing shores
[单项选择]MIST is caused by（）.
A. forest fires
B. smoke from industrial areas
C. dust or sand storms
D. water droplets with the relative humidity more than 95%
[单项选择]Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.
A. hydraulic fluid contamination
B. excessive fluid friction
C. turbulent fluid flow
D. fluid pressure surges
[单项选择]Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drainedAccording to the above sentence, which of the following statements is true?（）
A. Oil vapour in air piping are dangerous
B. Explosion will cause oil vapouring in air lines
C. Oil vapour in air piping should be drained
D. Oil in air piping should not be drained
[单项选择]Deviation is caused by（）.
A. changes in the earth's magnetic field
B. nearby magnetic land masses or mineral deposits
C. magnetic influence inherent to that particular vessel
D. the magnetic lines of force not coinciding with the lines of longitude
[单项选择]After deploying the anchor，a permanent chain chaser is（）.
A. removed from the anchor chain
B. connected to a buoy at the anchor
C. stripped back to the rig and secured
D. connected to a buoy halfway down the chain
[单项选择]What is the primary disadvantage of a permanent chain chaser system?（）
A. It requires anchor handling boats with more horsepower
B. Chain chasers work in shallow water only
C. Chain chasers will not work with piggyback anchors
D. It takes longer to deploy anchors using chain chasers
[单项选择]Haze is not caused by（）.
A. forest fires
B. smoke from industrial areas
C. dust or sand storms
D. water droplets with the relative humidity more than 95%
