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【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
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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 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
【单选题】How does the Lion Hall get the name?
A.
A lion sculpture is here.
B.
A stalagmite here looks like a lion.
C.
Lions used to live here.
D.
The entire hall looks like a lion.
【单选题】The properties of synthetic fundamental magneto motive force produced by three-phase AC winding are ()
A.
The magnetomotive force is a sine wave along the circumference of the air gap.
B.
The amplitude of the magnetomotive force sine wave is constant;
C.
The magnetomotive force sine wave rotates at a synchronous speed
D.
All of the above.
【单选题】The generator generates electromotive force through rotation. It is a device that can continuously provide current, so it is called ().
A.
The power supply
B.
Electromotive force
C.
Voltage source
D.
Voltage
【单选题】What makes the Lion Hall a natural music hall?
A.
honeycomb caverns in the ceiling
B.
the roaring of lions
C.
the rushing rivers
D.
the heavy wind
【多选题】下列有关先心病CTA检查技术的叙述,正确的是()
A.
选择非离子型对比剂浓度为300mg/ml,可避免明显硬化束伪影
B.
儿童监测层面在四心腔层面
C.
儿童多采用手动触发扫描
D.
成人多取CT值达100Hu阈值时,自动触发扫描