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【判断题】
入肾门的结构主要有肾动脉、输尿管;出肾门的结构主要有肾静脉。A.
正确
B.
错误
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【简答题】A specimen of nickel powder is studied by X—ray diffractometry．The sample is irradiated with Cr Kα radiation，which has a wavelength，λ，of 2．29 ．Only three diffraction peaks are observed in total：(111)，...
【单选题】Most conducting materials such as copper, aluminum, iron, nickel, and tungsten _____.
A.
increase in resistance with increased temperature
B.
increase in resistance with decreased temperature
C.
decrease in resistance with increased temperature
D.
increase in conductance with increased temperature
【单选题】All the following are mainly produced in Canada EXCEPT
A.
nickel.
B.
zinc.
C.
asbestos.
D.
steel.
【简答题】nickel的意思是___________.
【单选题】Canada is the worlds ______producer of nickel, zinc, and asbestos.
A.
primary
B.
second
C.
third
D.
fourth
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