Nuclear Power Engineering
A control rod

Both B and C
Should have large absorption cross-section
Should have small absorption cross-section
Is generally made of boron, hafnium or cadmium

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

Quantity of fuel required for initiating fusion reaction is prohibitively high
It is difficult to initiate fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to control fusion reaction

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