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【单选题】
A three-phase synchronous generator runs stably under a symmetrical load(
) At this time, the armature reaction property is ( ).
A.
Straight-axis magnetic armature reflection;
B.
There are both straight-axis demagnetic armature reaction and cross-axis armature reaction;
C.
There are both straight-axis magnetic armature reactions and cross-axis armature reactions;
D.
There are both straight-axis armature reactions (demagnetization, magnetism-assistant) and cross-axis armature reactions.
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参考解析：
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举一反三
【单选题】下列有关胸痛三联征CTA检查时对比剂注射方案的叙述,错误的是()
A.
使用高压注射器注射
B.
常规左肘静脉团注
C.
注射总量40~60ml
D.
注射速率4.0~6.0ml/s
E.
碘对比剂浓度300~370mgI/ml
【单选题】In Tibetan culture, "Meili Snow Mountain" means ______.
A.
a high mountain
B.
a sacred mountain
C.
a dangerous mountain
D.
the mountain of the medicine king
【单选题】When the synchronous generator is running in a steady state, if the load is inductive , the nature of its armature reaction is ().
A.
Cross-axis armature reaction
B.
Straight-axis demagnetization armature reaction
C.
Straight axis demagnetization and intersectional armature reaction
D.
Straight axis magnetization reacts with cross-axis armature
【单选题】双源CT行胸痛三联征CTA检查时,可变螺距与心率的关系是()
A.
螺距不随心率变化而变化
B.
螺距随心率增加而增加
C.
螺距随心率增加而减少
D.
屏气后心率变化较大时,螺距不改变
E.
螺距由操作技术员决定
【单选题】For the standard linear programming problem, the following statement is wrong ( )
A.
In the sensitivity analysis of new variables, if the new variables can enter the basic variables, the objective value will be further improved
B.
In sensitivity analysis with new constraints, the value of the new optimal objective value cannot be increased
C.
When a constraint constant bk increases, the value of objective value will increase
D.
When the objective coefficient of a basic variable increases, the objective value will be improved
【单选题】In 1991, international mountaineers lost their lives in Meili Snow Mountain due to ______.
A.
a storm
B.
an avalanche
C.
an eathquake
D.
a tornado
【单选题】If the objective coefficient of a non-basic variable in the optimal basis of linear programming problem changes, then ( )
A.
The test number of this basic variable changes
B.
The test number of other basic variables changes
C.
The test numbers of all non-basic variables change
D.
The test numbers of all variables change
【判断题】In Beat 2 of the Horse Stance Side-step Movement, both hands end up in the ready stance.
A.
正确
B.
错误
【单选题】When measuring the short-circuit characteristics of synchronous generators, if the speed decreases by , the measured short-circuit characteristics ( ).
A.
Be unchanged
B.
Increase by 0.8 times
C.
Reduce by 0.8 times.