单项选择题
Permanent magnetism is found in（）.
A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
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相关考题
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单项选择题
Permanent magnetism is caused by（）.
A.operation of electrical equipment and generators on board ship
B.the earth's magnetic field affecting the ship's hard iron during construction
C.the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D.the vertical component of the earth's magnetic field acting on the vertical soft iron -
单项选择题
It is not necessary to declare（）in the Health List.
A.Appendicitis
B.Cholera
C.Plague
D.Typhus fever -
单项选择题
It is not necessary to declare（）in MARITIME HEALTH DECLARATION.
A.Jaundice by fever
B.Acute skin rash or eruption with or without fever
C.Duodenitis
