[问答题]
(a) Compare the energy needed for the first reaction of the carbon ,0fdzw1 8az-uvw(pcf cycle to tlb 0sd3 wv 9v*,xhc0ewhat for a deuterium-tw3 ,s we*0 b90vdhxlvcritium reaction.
(b) If a deuterium–tritium reaction requires $T \approx 3 \times 10^8\ \text{K}$, estimate the temperature needed for the first carbon-cycle reaction.