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【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
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【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.
【单选题】The reason why the stable short-circuit current of the synchronous generator is not very large ( ).
A.
Large leakage impedance
B.
Short-circuit current produces strong demagnetization;
C.
The armature reaction produces magnetization
D.
The synchronous reactance is relatively large.
【多选题】which ones are the special cloud views of Mount Cangshan in Dali？
A.
Husband-Expecting Clouds
B.
Jade Belt Clouds
C.
summer clouds
D.
winter clouds
【单选题】These natural veins of marbles are spoken of as “______”.
A.
Natural weavings
B.
Natural Chinese Paintings
C.
Natural Oil Paintings
D.
Natural landscapes