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【单选题】

How old is the Stone Forest?

A.
50 million years old
B.
530 million years old
C.
270 million years old
D.
230 million years old
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【判断题】A waist drum consists of drum clapper, drum head, drum ring, drum belt, drumstick and drum silk.
A.
正确
B.
错误
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【判断题】颈胸交界处血管CTA技术对小血管管腔内病变的诊断效能优于DSA检查。 ( )
A.
正确
B.
错误
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【单选题】A Y/y0-12 and a Y/y0-8 three-phase transformer with the same ratio, whether it can be run in parallel after modification ().
A.
can
B.
cannot
C.
not always
D.
It can be connected without changing
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【多选题】What are the factors that resulted in the formation of the Stone Forest in Yunnan?
A.
the remains of dead corals
B.
the fossils of oceanic living beings
C.
The ancient sea slowly receded.
D.
the erosion from water and carbon dioxide
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【判断题】Drumstick is also called drum arrow, a wood, plastic or iron stick used for beating the waist drum. It is generally 20-25cm long.
A.
正确
B.
错误
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【判断题】对于甲状腺肿瘤,短期内做过核素检查及治疗的患者应尽量选用CT检查。( )
A.
正确
B.
错误
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【单选题】For two transformers with the same rated capacity, connection group and change ratio, if the unit value of short-circuit impedance of transformer ⅰ is twice that of transformer ⅱ, namely , and the loa...
A.
, ;
B.
, ;
C.
, 。
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【单选题】What makes the Stone Forest blackish?
A.
the erosion from rainfall
B.
the erosion from earth
C.
the early living beings
D.
some algae and micro-organisms
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【判断题】When wearing a waist drum, one should make the waist drum close to the left abdomen above the hip joint and below the ribs.
A.
正确
B.
错误
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【多选题】下列有关颈胸交界处CT检查图像质量的叙述,正确的是()
A.
颈胸交界处图像噪声相对较高
B.
颈胸交界处射线硬化伪影明显
C.
图像噪声随着管电流、管电压的增加而增加
D.
基于模型的迭代重建技术无法降低图像噪声
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