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【单选题】
The load of the transformer is resistive and inductive, and its external characteristic curve shows ().
A.
Ascending curve
B.
Descending curve
C.
It's almost a straight line
D.
Irregular change
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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】下列有关头颈部CTA临床应用的叙述,错误的是()
A.
可诊断血管解剖变异
B.
可评估颈动脉、椎动脉狭窄与闭塞
C.
在检出动脉粥样硬化管壁斑块方面优于DSA
D.
在判断动脉狭窄程度上不如MR
E.
可显示颈动脉、椎动脉夹层
【单选题】下列有关头颈部CTA扫描技术的叙述,错误的是()
A.
瞳间线与横向定位线平行
B.
扫描范围从额结节至胸骨角
C.
常规注射速率为每秒2-3ml
D.
可选择时间减影或能量减影扫描模式
E.
颈部静脉成像延时时间较动脉成像延迟10-15秒
【单选题】Transformer load is capacitive, load increases, side voltage ().
A.
be on the rise
B.
invariant
C.
It could go up or down
【单选题】What does "perseverance" mean?
A.
the passion
B.
the bravery
C.
the action to insist on sth
D.
the ideology
【单选题】The State Council announced in （ ） that the Ansei Waist Drum is an intangible cultural heritage of China.
A.
2006年6月
B.
2007年6月
C.
2008年6月
D.
2009年6月
【单选题】Transformer primary winding plus rated frequency rated voltage, under a given load power factor, the ratio of the difference between secondary no-load voltage and () and secondary rated voltage is cal...
A.
Secondary short-circuit voltage
B.
Secondary load voltage
C.
Primary rated voltage
【单选题】The no-load loss of a transformer =600W and short-circuit loss =2100W. When the maximum efficiency is reached, the total loss of the transformer is ().
A.
2700 W
B.
4200 W
C.
1200 W
D.
1500 W
【单选题】What does "patriotism" mean?
A.
the belief in socialism
B.
the love towards motherland
C.
the devotion to family
D.
the efforts for reform