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【单选题】
原子是由居于中心的原子核和()构成的。A.
质子
B.
核外电子
C.
中子
D.
离子
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举一反三
【单选题】The direction of rotation of an induction motor is ________.
A.
opposite the rotating field direction
B.
the same as the direction of the rotating field
C.
determined by the number of poles
D.
determined by the staggering of the brushes
【单选题】An electron moves in the negative x direction, through a uniform magnetic field in the negative y direction. The magnetic force on the electron is:
A.
in the positive z direction
B.
in the negative z direction
C.
in the positive y direction
D.
in the negative x direction
【简答题】网络传输介质主要有: 同轴电缆 、 、 、 。
【简答题】Flying in a westward direction will
【简答题】网络传输介质有（）、同轴电缆、（）和无线传输4种。
【多选题】The direction indices represent
A.
The connecting line between any two points within a crystal.
B.
The parallel, codirectional crystallographic direction of a crystal.
C.
The connecting line between vertex.
D.
The direction and distance between atoms.
【简答题】A．guide B．model C．symbol D．direction
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