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【单选题】
If the constraint equation contains a variable whose coefficient sequence vector is the unit vector, then it is unnecessary to introduce ( ) into this constraint equation.
A.
relaxation variable
B.
residual variable
C.
artificial variable
D.
free variable
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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】下列先心病中有必要行CTA检查的,不包括()
A.
较小的房间隔缺损
B.
右位主动脉弓
C.
动脉导管未闭
D.
法洛四联症
E.
肺静脉畸形引流
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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
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【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
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【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
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【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
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【单选题】下列哪一种分型不属于房间隔缺损根据病理解剖位置的分型()
A.
中央型
B.
周围型
C.
上腔静脉型
D.
下腔静脉型
E.
混合型
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【判断题】Beat 7 of the Waist-twining 360-degree-turn Beating: Withdraw the left foot, meanwhile turn left rear by 180 degrees with the right foot as axis.
A.
正确
B.
错误
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【单选题】Those upside-down-growing cone-shaped stones are called _____.
A.
stalactites
B.
stalagmites
C.
marble
D.
pebbles
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【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
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