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【判断题】
In the x method, if the exchange variables are not selected according to the minimum ratio principle, at least one of the basic variables in the next solution is negative. ( )
A.
正确
B.
错误
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.
【单选题】What is the formation of stalactites mainly related to?
A.
The erosion of calcium carbonate
B.
The precipitation of calcium carbonate
C.
earthquakes
D.
the corrosion from wind
【单选题】The synthetic fundamental magneto motive force generated by the AC three-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.
【多选题】下列有关先心病CTA检查上腔静脉伪影的叙述,正确的是()
A.
如果上腔静脉内对比度浓度过大,则产生的线束硬化伪影明显
B.
若线束硬化伪影明显,则不利于周围结构及病变的显示
C.
先注射一定剂量的对比剂、再注射生理盐水的方法,上腔静脉硬化束伪影较大
D.
采用对比剂与生理盐水同时注射,可以有效降低上腔静脉内伪影