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【单选题】
Essential elements (i.e. nitrogen and phosphorous) serve what essential function?(Please choose one correct answer)
A.
They help to regulate biological processes and shape life on earth
B.
They are the elements taken up by microorganisms and drive all primary production
C.
They are the man-made components that act as catalysts for creating artificial fertilizers
D.
They are all the elements that can be found on the periodic table
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【单选题】下列有关颈椎MR扫描技术要点与质量控制的叙述,错误的是()
A.
颈椎前方设置预饱和带,有助于减少吞咽动作伪影及颈血管搏动伪影
B.
采用层面选择方向流动去相位技术,能减少脑脊液流动伪影
C.
矢状位相位编码方向取头-足方向
D.
冠状位相位编码方向取头-足方向或左-右方向
E.
横轴位相位编码方向取前-后方向时,有卷积伪影的影响
【单选题】The Dai culture is also known as ( )
A.
the Dongba culture
B.
the Bimo culture
C.
the Pattra-leaf culture
D.
the Munao culture
【单选题】What is the main source of alterations to N and P flows in the Anthropocene?(Please choose one correct answer)
A.
Excessive algal growth
B.
The use of chemical fertilizers in agriculture
C.
Climate change
D.
Ocean acidification
【单选题】Why is it important to limit nitrogen 'N' and phosphorus 'P' flows?(Please choose one correct answer)
A.
Because N and P inhibit algal growth
B.
Because excess N and P disrupts biogeochemical cycles
C.
Because soils are N and P saturated
【单选题】What are atmospheric aerosols?(Please select one answer)
A.
Volcanic and combustion gases emitted to the atmosphere
B.
Liquid droplets and fine solid particles suspended in the atmosphere
C.
CO2 added to the atmosphere by human activities
相关题目：
【单选题】下列有关颈椎MR扫描技术要点与质量控制的叙述,错误的是()
A.
颈椎前方设置预饱和带,有助于减少吞咽动作伪影及颈血管搏动伪影
B.
采用层面选择方向流动去相位技术,能减少脑脊液流动伪影
C.
矢状位相位编码方向取头-足方向
D.
冠状位相位编码方向取头-足方向或左-右方向
E.
横轴位相位编码方向取前-后方向时,有卷积伪影的影响
【单选题】The Dai culture is also known as ( )
A.
the Dongba culture
B.
the Bimo culture
C.
the Pattra-leaf culture
D.
the Munao culture
【单选题】What is the main source of alterations to N and P flows in the Anthropocene?(Please choose one correct answer)
A.
Excessive algal growth
B.
The use of chemical fertilizers in agriculture
C.
Climate change
D.
Ocean acidification
【单选题】Why is it important to limit nitrogen 'N' and phosphorus 'P' flows?(Please choose one correct answer)
A.
Because N and P inhibit algal growth
B.
Because excess N and P disrupts biogeochemical cycles
C.
Because soils are N and P saturated
【单选题】What are atmospheric aerosols?(Please select one answer)
A.
Volcanic and combustion gases emitted to the atmosphere
B.
Liquid droplets and fine solid particles suspended in the atmosphere
C.
CO2 added to the atmosphere by human activities
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