A.溫差不超過(guò)15K B.熱點(diǎn)溫度70℃,相對(duì)溫差大于80% C.熱點(diǎn)溫度大于90℃,相對(duì)溫差大于80% D.熱點(diǎn)溫度大于130℃,相對(duì)溫差大于95%