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【判断题】
任何一个无穷数列必存在极限A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】there are two types of vibrations, they are vertical vibration and vibration.
A.
horizontal
B.
lateral
C.
vertical
D.
longitudinal
【单选题】The vertical angle between the horizontal and the magnetic line of force is the（）.
A.
elevation
B.
magnetic angle
C.
vertical angle
D.
dip
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.
A.
the horizontal component of the permanent magnetism
B.
deviation caused by the vessel's inclination from the vertical
C.
induced magnetism in the horizontal soft iron
D.
induced magnetism in the vertical soft iron
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．
A.
The horizontal component of the permanent magnetism
B.
Deviation caused by the vessel's inclination from the vertical
C.
Induced magnetism in the horizontal soft iron
D.
Induced magnetism in the vertical soft iron
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