单项选择题

Education, reserved to the states or the people in file U. S., is a ______ of the state, not the federal government.

A．condition
B．performance
C．requirement
D．function
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单项选择题
Which of the following does NOT help to separate the useful U-235 and nearly useless U~2387
A．The principle of gaseous diffusion.
B．A process involving magnetic separation of the two isotopes.
C．A process nearly identical in the chemical makeup.
D．A gas centrifug
单项选择题
Which one of the following that has been working at the making of the atomic bomb from beginning to end
A．Albert Einstein.
B．Harold
C．Urey.C. Ernest O. Lawrence.
D．J. Robert Oppenheimer.
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