A.40% B.80% C.20% D.95%
A.增強(qiáng)煙氣側(cè)和空氣側(cè)的放熱系數(shù) B.增強(qiáng)煙氣側(cè)的放熱系數(shù)或降低空氣側(cè)的放熱系數(shù) C.降低煙氣側(cè)的放熱系數(shù)或增強(qiáng)空氣側(cè)的放熱系數(shù)
A.110~115V B.114~116V C.105~108V D.110~130V