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刷刷题刷刷变学霸
举一反三
【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