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【单选题】
闻之无氨臭，加NaOH又有氨臭味，在铁片上灼烧时熔融无残留物，加BaCl2生白色沉淀的肥料是（）
A.
硝酸铵
B.
尿素
C.
硫酸铵
D.
氯化铵
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【单选题】Los Alamos National Laboratory scientists are using a new technique to see fingerprints on surfaces that typically make them invisible. The method uses a technology called mini-X-ray fluorescence (荧光)...
A.
the powder used in the conventional methods
B.
images that can only be seen in computer
C.
a scanner that is connected to a computer
D.
the memory of any digital recorders
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【单选题】Los Alamos National Laboratory scientists are using a new technique to see fingerprints on surfaces that typically make them invisible. The method uses a technology called mini-X-ray fluorescence (荧光)...
A.
the powder used in the conventional methods
B.
images that can only be seen in computer
C.
a scanner that is connected to a computer
D.
the memory of any digital recorders
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