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【单选题】
The three-phase stator windings of the generator are generally star connection, which is mainly to eliminate ().
A.
Accidentally harmonic
B.
Three times harmonic
C.
Five times the harmonic
D.
Higher harmonic
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The temperature measuring components of generator stator coil are usually buried in ()
A.
Upper bar notch
B.
Between lower bar and iron core
C.
Between upper and lower bars
D.
Lower wire bar notch
【单选题】How does the Jade Dragon Snow Mountain get the name?
A.
The totem of local people is dragon.
B.
There is a jade dragon sculpture in the mountain.
C.
The snow-capped peaks look like a jade dragon.
D.
The cloud view here resembles a jade dragon.
【单选题】The relationship between original programming and dual programming can be described as ( )
A.
The primal problem has a feasible solution, and the dual problem also has a feasible solution
B.
The dual problem has no feasible solution, and the original problem also has no feasible solution
C.
The primal problem has an optimal solution, while the dual problem certainly has no optimal solution
D.
The original problem has no bounded solution and the dual problem has no feasible solution
【单选题】Rated power of synchronous generator refers to ().
A.
Mechanical power input to the rotating shaft
B.
The mechanical power output on the rotating shaft
C.
The electrical power input to the armature port
D.
The electrical power output from the armature port
【单选题】The in-march Waist-twining Beating Beat 1: Step the left foot forward to the upper （ ） form a left bow stance. Beat 2: Step the right foot forward to the upper （ ） to form a right bow stance.
A.
right、right
B.
left、left
C.
right、left
D.
left、right
【单选题】When the generator is in operation, when the stator magnetic field and the rotor magnetic field rotate in the same direction and with the same (), it is called synchronization.
A.
speed
B.
frequency
C.
amplitude
D.
Valid values
【单选题】What results in the existance of glaciers in the low latitude area?
A.
The snowy weather
B.
The high elevation of the mountain
C.
The dry climate
D.
The cautious protection
【单选题】Synchronous generator with three-phase symmetric load stable operation, rotor excitation winding ().
A.
Inductive low frequency electromotive force
B.
Induction fundamental emf
C.
Induction direct current electromotive force
D.
Non-inductive emf
【单选题】下列有关冠状动脉CTA和冠状动脉DSA造影的叙述,错误的是()
A.
对冠状动脉先天变异,DSA可显示冠状动脉周围组织结构
B.
冠状动脉CTA可直接显示左右冠脉起源、走行及其与周围解剖结构的空间关系
C.
冠状动脉DSA显示冠状动脉狭窄优于冠脉CTA
D.
冠状动脉CTA 可评价冠状动脉搭桥术后桥血管的通畅情况
E.
冠状动脉CTA可诊断冠状动脉支架置入术后有无再次狭窄