单项选择题

Scientists created ultra fine films of specialized crystals by means of ______.

A．a scanning probe microscope
B．a nanoscale device
C．a molecular beam epitaxy
D．a super computer
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单项选择题
Who proved that Feyman's concept, There's Plenty of Room at the Bottom was right
A．Chad Mirkin at Northwestern University
B．Researchers at Almaden Research Center
C．Scientists manipulating atoms and "spray painting"
D．A professor at the California Institute of Technology
单项选择题
Simon's letter was in such a casual scrawl, and in such pale ink, that it was ______.
A．vague
B．ambiguous
C．illegible
D．obscure
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