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【单选题】
If the three-phase symmetric current of
,
,
and is entered into the three-phase symmetric winding, the amplitude of the three-phase fundamental wave resultant magneto motive force is located at () when The three-phase symmetric winding is
.
A.
U-phase winding axis
B.
V-phase winding axis
C.
W-phase winding axis
D.
A location away from the axis of the three-phase winding
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举一反三
【单选题】Assuming that the amplitude of the single-phase pulsating magnetomotive force decomposed into two rotating magnetomotive forces is f, the amplitude of the three-phase synthetic magnetomotive force is(...
A.
2/3F
B.
F
C.
3/2F
D.
3F
【单选题】下列有关先心病CT检查技术的叙述,错误的是()
A.
婴幼儿需在熟睡状态下扫描,无法熟睡者应行镇静
B.
扫描范围从胸廓入口至膈下5cm
C.
一般采用左上肢建立静脉通道
D.
对比剂与生理盐水同步注射,二者总量相等
E.
后处理技术多采用VR、MIP及MPR
【单选题】If the three-phase symmetrical winding is connected with the three-phase three-phase current iA=Im ,iB=Im ,iC=Im , when wt = 210°, the amplitude of the three-phase fundamental wave resultant magnetomo...
A.
A-phase winding axis
B.
B-phase winding axis
C.
C-phase winding axis
D.
A position outside the axis of the three - phase winding
【单选题】Beat 5 of the Waist-twining 180-degree-turn Beating: Step the left foot（ ）to form a bow stance.
A.
left front
B.
forward
C.
right front
D.
backward
【单选题】The magnetic force generated by ac single-phase winding is a function of both time and space, which refers to ().
A.
The current is A function of time and the magnetomotive force is A function of space;
B.
The magnetomotive force is a function of time and the current is a function of space;
C.
The magnetic force is distributed cosine in space and rotates with time;
D.
The amplitude of the magnetomotive force is pulsating with time, and the magnetomotive force is distributed cosine in space.
相关题目：
【单选题】Assuming that the amplitude of the single-phase pulsating magnetomotive force decomposed into two rotating magnetomotive forces is f, the amplitude of the three-phase synthetic magnetomotive force is(...
A.
2/3F
B.
F
C.
3/2F
D.
3F
【单选题】下列有关先心病CT检查技术的叙述,错误的是()
A.
婴幼儿需在熟睡状态下扫描,无法熟睡者应行镇静
B.
扫描范围从胸廓入口至膈下5cm
C.
一般采用左上肢建立静脉通道
D.
对比剂与生理盐水同步注射,二者总量相等
E.
后处理技术多采用VR、MIP及MPR
【单选题】If the three-phase symmetrical winding is connected with the three-phase three-phase current iA=Im ,iB=Im ,iC=Im , when wt = 210°, the amplitude of the three-phase fundamental wave resultant magnetomo...
A.
A-phase winding axis
B.
B-phase winding axis
C.
C-phase winding axis
D.
A position outside the axis of the three - phase winding
【单选题】Beat 5 of the Waist-twining 180-degree-turn Beating: Step the left foot（ ）to form a bow stance.
A.
left front
B.
forward
C.
right front
D.
backward
【单选题】The magnetic force generated by ac single-phase winding is a function of both time and space, which refers to ().
A.
The current is A function of time and the magnetomotive force is A function of space;
B.
The magnetomotive force is a function of time and the current is a function of space;
C.
The magnetic force is distributed cosine in space and rotates with time;
D.
The amplitude of the magnetomotive force is pulsating with time, and the magnetomotive force is distributed cosine in space.
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