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【单选题】
When the generator is running with pure resistance load, the phase difference between voltage and current is equal to ().
A.
180°
B.
90°
C.
0°
D.
5°
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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 iteration of dual simplex method starts with ( ).
A.
the feasible solution of dual problem
B.
the optimal solution
C.
the feasible solution of the original problem
D.
the basic solution of the original problem
【单选题】When doing Beat 2 of the big Waist-twining Beating, lift up the right foot and withdraw to the right rear side with a distance about 40cm away from the left foot, point the tiptoe to （ ） degrees on t...
A.
30right
B.
45right
C.
45left
D.
30left
【单选题】When the generator is running with load, there is only energy () between the generator and the load.
A.
Consumption process
B.
Exchange process
C.
Consumption process and exchange process
D.
Not necessarily
【单选题】The array (λ1，,λ2……，λn）are the judgement coefficients in the optimal table of the canonical form original problem (max problem) , and the judgement coefficients of relaxation variables are（λn+1,λn+2,…...
A.
（λ1, λ2，……λn）
B.
(-λ1,-λ2,……,-λn)
C.
(-λn+1,-λn+2,……,-λn+m)
D.
( λn+1,λn+2,……,λn+m)
【单选题】How did Mount Cangshan get the name?
A.
The mountain has 19 peaks.
B.
The mountain is covered by the luxuriant vegetation.
C.
There are glaciers on the mountain top .
D.
There are a variety of wild animals in the mountain.
【单选题】If the objective coefficient of a 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