单项选择题

According to the passage, if there were 500 tons of uranium ore, how many tons of useful uranium-235 could be extracted

A．1 kilogram.
B．10 kilogram.
C．50 kilogram.
D．500 kilogram.
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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-238
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 did NOT cause so much trouble for the making of an atomic bomb
A．Extraction of uranium.
B．Sustentation of a reaction.
C．Conversion from uranium ore to uranium metal.
D．Separation of 1 U-235 and U-238.
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