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【单选题】
Transformers can be divided into power transformers, instrument transformers and () according to their uses.
A.
General transformer
B.
Booster transformer
C.
Special type transformer
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】The ______ in______ County is a real Jurassic Park in Yunnan.
A.
Dinasour Valley
B.
Yuanmou
C.
Luliang
D.
Lufeng
【单选题】The transformer core is made of silicon steel sheet with good magnetic conductivity, which can reduce the transformer ().
A.
Iron loss
B.
Copper loss
C.
Mechanical loss
【单选题】In Qin Dynasty, which road was functioning as a political and economic link between central China and frontier region in southwest China?
A.
The Southern Silk Road
B.
The Tea and Horse Caravan Road
C.
The ancient Sino-India Road
D.
The Five-Chi-Road
【单选题】Voltage regulation under secondary side load of transformer is called ().
A.
Voltage regulation without excitation
B.
On-load voltage regulating
C.
No load voltage regulation
【多选题】对于化脓性鼻窦炎,CT三维重建检查的目的是()
A.
显示炎症累及的所有窦房并准确定位
B.
显示窦口鼻道的狭窄与阻塞
C.
显示鼻窦区的解剖变异
D.
排除由于息肉及肿瘤等引起的继发鼻窦阻塞性炎症
【多选题】有关鼻骨骨折CT三维重建的意义在于()
A.
显示伴发的颅面部多发复杂骨折
B.
显示鼻骨的骨折线、骨碎片及移位情况
C.
可观察邻近软组织损伤情况
D.
排除血管沟、骨缝、鼻骨孔等正常结构,勿误为骨折线
【单选题】How old were the earliest human fossils in Yunnan?
A.
1 million years old
B.
1.7 million years old
C.
53 million years old
D.
3 million years old