单项选择题

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

A.A.permanent
B.subpermanent
C.induced
D.variable
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单项选择题
A.B.C.D.
A.
B.
C.
D.
单项选择题
The ______ has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm．A.chartplotterB.C-MAP NTC.C-CardsD.PPI
A.A.chartplotter
B.C-MAP
B.C-Cards
D.PPI
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