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【单选题】
The EMF frequency of a synchronous generator is 50Hz, the speed is 600r/min, and its polar logarithm is ().
A.
2
B.
5
C.
10
D.
20
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【单选题】Beat 6 of the Waist-twining 360-degree-turn Beating: Lift the right leg, turn right rear by 180 degrees, extend the tiptoe outward by （ ） degrees to form a bow stance.
A.
60
B.
30
C.
45
D.
90
【单选题】能够从任意角度显示复杂先天性心脏病的心内、心外及大血管的解剖结构和空间位置关系的最佳影像检查技术是()
A.
超声心动图
B.
心血管造影
C.
磁共振成像
D.
CTA
E.
ECT
【单选题】The "Magic Fields" here are actually _____.
A.
the terraced fields
B.
the farmland of local people
C.
the dams for irrigation
D.
the rimmed stone dams
【单选题】The purpose of introducing artificial variables into the constraint equation is ( ).
A.
reflecting the diversity of variables
B.
changing inequality into equality
C.
make the objective function optimal
D.
form a unit matrix
【单选题】Those upside-down-growing cone-shaped stones are called _____.
A.
stalactites
B.
stalagmites
C.
marble
D.
pebbles
【单选题】The generating capacity of the generator is measured in kwh, which is the unit name of ().
A.
Electric power
B.
voltage
C.
potential
D.
electricity
【单选题】When the artificial variable method is used to solve the maximized linear programming problem, when all the test numbers σj≥ 0, but there are still artificial variables in the base variables, it indic...
A.
There are unique optimal solutions
B.
There are infinite optimal solutions
C.
There are unbounded solutions
D.
There are no feasible solutions
相关题目：
【单选题】Beat 6 of the Waist-twining 360-degree-turn Beating: Lift the right leg, turn right rear by 180 degrees, extend the tiptoe outward by （ ） degrees to form a bow stance.
A.
60
B.
30
C.
45
D.
90
【单选题】能够从任意角度显示复杂先天性心脏病的心内、心外及大血管的解剖结构和空间位置关系的最佳影像检查技术是()
A.
超声心动图
B.
心血管造影
C.
磁共振成像
D.
CTA
E.
ECT
【单选题】The "Magic Fields" here are actually _____.
A.
the terraced fields
B.
the farmland of local people
C.
the dams for irrigation
D.
the rimmed stone dams
【单选题】The purpose of introducing artificial variables into the constraint equation is ( ).
A.
reflecting the diversity of variables
B.
changing inequality into equality
C.
make the objective function optimal
D.
form a unit matrix
【单选题】Those upside-down-growing cone-shaped stones are called _____.
A.
stalactites
B.
stalagmites
C.
marble
D.
pebbles
【单选题】The generating capacity of the generator is measured in kwh, which is the unit name of ().
A.
Electric power
B.
voltage
C.
potential
D.
electricity
【单选题】When the artificial variable method is used to solve the maximized linear programming problem, when all the test numbers σj≥ 0, but there are still artificial variables in the base variables, it indic...
A.
There are unique optimal solutions
B.
There are infinite optimal solutions
C.
There are unbounded solutions
D.
There are no feasible solutions
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