题目内容
Among the fourth-generation reactors, the reactor types that use closed fuel cycles are ______ , ______ , ______ , and ______ .
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The coolants that can be used as gas-cooled fast reactors are helium and ______ , which are characterized by good compatibility with the materials in the reactor, small neutron absorption cross-section, high outlet temperature, ______ S-CO2 density, and easy compression , The temperature required for the cycle does not need to be too high to be as efficient as the helium cycle.
Among the fourth-generation reactors, the reactor types that use different fuel forms are ______ and ______ .
For the fourth generation reactor, the greater the reaction power, the better the economy.
Ship nuclear power reactors can only be used in military applications, and the scope of civilian applications is very narrow.
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