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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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 of the following is NOT to be a source of stress, according to the author of this passage

A．Rapid changes in the world and technologies.
B．Perceived professional competence.
C．Work-related environments.
D．Rash personality characteristics.

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